Science topics: Mathematics
Science topic

Mathematics - Science topic

Mathematics, Pure and Applied Math
Questions related to Mathematics
  • asked a question related to Mathematics
Question
6 answers
Many scientists consider that mathematics is an invention of new concepts and relationships that did not exist before, but another group disagrees with them, and they consider that mathematics is a science that depends on discovery, as all that is formulated and proven are already unified relationships that are discovered and formulated in the way Appropriate only.
So what do you think?
Relevant answer
Answer
  • asked a question related to Mathematics
Question
29 answers
Hi everyone,
In engineering design, there are usually only a few data points or low order moments, so it is meaningful to fit a relatively accurate probability density function to guide engineering design. What are the methods of fitting probability density functions through small amounts of data or low order statistical moments?
Best regards
Tao Wang
Relevant answer
Answer
just to start your work, a link with simple text and several other useful links:
  • asked a question related to Mathematics
Question
14 answers
STEM fue el tema principal de la conferencia internacional ASTE 2019, con al menos 8 pósteres, 27 presentaciones orales y 3 talleres que promovieron las aulas STEM, la instrucción/enseñanza STEM, las lecciones STEM, los campamentos de verano STEM, los clubes STEM y las escuelas STEM sin proporcionar una conceptualización o definición operativa de lo que es STEM. Algunas presentaciones defendían la integración de las disciplinas, pero el ejemplo proporcionado fue principalmente prácticas "indagatorias" y de "diseño de ingeniería" que de hecho no diferían del tipo de actividades en el aula hands-on/minds-off mal conceptualizadas y epistemológicamente incongruentes.
Por lo tanto, vale la pena considerar:
(1) ¿Por qué lo llamamos STEM si no difiere de las prácticas aplicadas durante décadas (por ejemplo, indagación, actividades hands-on)?
(2) ¿Qué beneficios (si los hubiere) puede aportar esta mentalidad/tendencia de STEMinificación a la educación científica y su investigación?
Relevant answer
Answer
1) Moda
2) Igualdad supuestamente.
  • asked a question related to Mathematics
Question
4 answers
Dear colleagues, please tell me a link to materials about mathematics of Dropout regularization in ANN. I perfectly understand how this algorithm works in practice, but I don't quite understand the mathematics.
Relevant answer
Answer
Thank you, dear Muhammad Ali!
  • asked a question related to Mathematics
Question
6 answers
I know that an infant's brain can repair itself when damaged but why doesn't the same happen in adults after stroke or brain injuries?
Relevant answer
Answer
With Regenerative Medicine, using stem cells, the ongoing Programs are doing it, with good results and promising expectations.
  • asked a question related to Mathematics
Question
7 answers
Hello everyone
I would really appreciate it if anyone could give some idea of some mathematical techniques for developing correlation for a dependent variable, W which has to be defined as W=f(x,y,z) where the individual functions are in form of power-law, W=a(x^b), W=c(y^d) and W=e(z^f).
Relevant answer
Answer
The simplest advice via the remark:
Logarithm of the equations implies linear formulas for the dependence of log W on log x , log y and log z.x,
  • asked a question related to Mathematics
Question
10 answers
In general in mathematics we work with groups that includ numbers, generally we work with constants.
So for exempel: For any x from R we can choose any element from R we will find it a constant, the same thing for any complex number, for any z from C we will find it a constant.
My question say: Can we find a group or groups that includ variabels not constants for exemple, we named G a group for any x from G we will find an x' it's not a constant it's another variabel ?
and if it exisit can you give me exempels ?
Thank you !
Relevant answer
  • asked a question related to Mathematics
Question
3 answers
While working in both the software, after loading the training and validation data for the prediction of a single output using several input variables (say 10), it skips some of the inputs and delivered an explicit mathematical equation for future prediction of the specific parameter but it skips some of the input variables (say 2 or 3 or maybe greater). What criteria are these software uses in the back for picking the most influential parameters while providing a mathematical predictive model?
Relevant answer
Answer
Look the link, maybe useful.
Regards,
Shafagat
  • asked a question related to Mathematics
Question
15 answers
Let P be a polynomial whose coefficients are equal to ±1. Prove that 1/2 < |z0| < 2 for any root z0 of P.
  • asked a question related to Mathematics
Question
1 answer
Hello
Can someone help me to solve this?
Because I really don't know about these problems and still can't solve it until now
But I am still curious about the solutions
Hopefully you can make all the solutions
Sincerely
Wesley
Relevant answer
Answer
Hi In what area was the issue raised? Euclidean space, Hilbert space, Banach space?
  • asked a question related to Mathematics
Question
6 answers
Austrian-born mathematician, logician, and philosopher Kurt Gödel created in 1931 one of the most stunning intellectual achievements in history. His shocking incompleteness theorems, published when he was just 25, proved that within any axiomatic mathematical system there are propositions that cannot be proved or disproved from the axioms within the system. Such a system cannot be both complete and consistent.
The understanding of Gödel’s proof requires advanced knowledge of symbolic logic, as well as Hilbert and Peano mathematics. Hilbert’s Program was a proposal by German mathematician David Hilbert to ground all existing theories to a finite, complete set of axioms, and provide a proof that these axioms were consistent. Ultimately, the consistency of all of mathematics could be reduced to basic arithmetic. Gödel’s 1931 paper proved that Hilbert’s Program is unattainable.
The book Gödel’s Proof by Ernest Nagel and James Newman provides a readable and accessible explanation of the main ideas and broad implications of Gödel's discovery.
Mathematicians, scholars and non-specialist readers are invited to offer their interpretations of Gödel's theory.
Relevant answer
Answer
The idea is you have to go out of the system in order to prove some results.
Like the Fermat problem needed things like Eliptic curves also, foreign to just
plain integer arithmetic.
That is if you mix up a bunch of rules, there are also unexpected side effects which might be true, but cannot be proven. Some results are random (prime numbers)
Many other problems are still open.
  • asked a question related to Mathematics
Question
4 answers
When I observed mathematics education in preservice teachers at my university, I found that What students learn in mathematics classes does not match what is needed in school mathematics classes. That led to my initiation to do design research, a Hypothetical Learning Trajectory that contains a sequence of learning processes related to elementary school mathematics learning. I consider starting with observations in elementary math class to identify misconceptions, then jointly reviewing issues on campus, conducting literature reviews, designing lessons to address identified problems, implementing them in class and evaluating the results. The final result is a Local Instructional Theory on Learning about Teaching Mathematics for prospective teachers to overcome misconceptions that occur in elementary mathematics classes. I need so many suggestions to do this research.
Relevant answer
Answer
From my experience your idea has been voiced by every teacher in every subject from the beginning of teaching. In addition, myself and very teacher wants a concept close to what you describe. So much so that they have refined it and set it in place as a curriculum goal at all levels of education.
And it usually fails in real-world classrooms. Especially teaching students from 5 to 18 years old. These are people in their early stages of developing skills to learn. And by their nature never at the same levels. To me those needs come first. You can be successful as a teacher and at same time put aside the obvious theory and hopeful goals.
Like someone else here suggested, spend a few years with the children you hope to help and find out what their needs are and those of their families and community VS what you think they are. First experience helping people to learn before you decide how they should learn and how to organize the curriculum.
Mathematical skills, concepts and facts - like anything else - are easily learned. With a big "if"...if the child likes to learn and has had people help them along the way.
  • asked a question related to Mathematics
Question
21 answers
In 2010, Dr. Khmelnik has found the suitable method of resolving of the Navier-Stokes equations and published his results in a book. In 2021, already the sixth edition of his book was released that is attached to this question for downloading. Here it is worce to mention that the Clay Mathematics Institute has included this problem of resolving of the Navier-Stokes equations in the list of seven important millennium problems. Why the Navier-Stokes equations are very important?
Relevant answer
Answer
I finally could check the PDF, Prof. Aleksey Anatolievich Zakharenko
Dr. Khmelnik uses a variational principle to solve the NS equation, which is very powerful indeed.
He also discusses and gives examples & a reason for turbulence.
I know that the solution of NS is a non-linear problem that involves several modes and that it depends on the source.
However, my knowledge of the foundations of NS is very limited to a few linear/non-linear problems on non-equilibrium gas dynamics& MHD solved by the method, Prof. Miguel Hernando Ibanez had.
Thank you for sharing the link. I recovered my account.
  • asked a question related to Mathematics
Question
1 answer
According to the resources; there is used to algorithm in HOMER sotware, grid search algorithm and derivative-free algorithm.
So how can I find the mathematical formulas of these algorithm ?
Please if you know the way or source help me
Thank you
Relevant answer
Answer
I am not sure yet whether the answer is included in the following HelpManual, I will search for that manual and please you search also. https://www.homerenergy.com/pdf/HOMER2_2.8_HelpManual.pdf
  • asked a question related to Mathematics
Question
6 answers
Hello! I have an exercise to do and I am struggling with it for a week ago. I have a 2D flow with the initial velocity at the inlet=0.01m/s. And I want to calculate the numerical results of the velocity which is the function of x and y direction (U(x,y)) in the domain of the water flow. For example if I want to calculate the velocity at the distance x1 and x2 (as in the figure) in the function of x and y., how can I calculate it? Please note that it is incompressible flow. It is fully developed after it passed the entrance length. The height of the domain is 0.02 m and the length is 1 m. Please help me! You can see the following figure. Thank You in advance! I will appreciate your help !
Relevant answer
Answer
Finally, I did it after I know how to use 1st Simpson Rule to apply this problem!
  • asked a question related to Mathematics
Question
3 answers
According to the resources; there is two algorithm used in HOMER sotware optimization process; grid search algorithm and derivative-free algorithm.
So how can I find the mathematical formulas of these algorithm ?
Please if you know the way or source help me
Thank you
Relevant answer
Answer
Table of Contents for a book suggested by David Eugene Booth is available at:
  • asked a question related to Mathematics
Question
3 answers
I mean the mathematical component of said process.
Relevant answer
Answer
coupled eulerian lagrangian (cel in abaqus, ale in ls-dyna)
  • asked a question related to Mathematics
Question
4 answers
Mathematical about the work-related with graphene or any other type of films/coatings.
Lubrication equations in solid films.
Relevant answer
Answer
The thesis "Aspects of Flow and Viscoelasticity in a Model Elastohydrodynamically Lubricated Contact"
by Ellen van Emden at UT Twente, might give you some ideas!
  • asked a question related to Mathematics
Question
11 answers
Please look at the mathematical construction of theta and zeta functions in the representation of a winding sphere. In this paper, based on the representation of the winding of a sphere, we construct a proof of the Riemann hypothesis of nontrivial zeros. Could you check this proof?
Relevant answer
Answer
Yes, I agree.
  • asked a question related to Mathematics
Question
4 answers
The temptation in all the remodeling of the study plans to train teachers that I have experienced, faced with a new strong point of interest, has been to introduce a subject that caters for it. Thus, environmental education, for example, has been the curriculum of Spain for more than 25 years.
Now the SDGs are the focus of attention, and the university is committed to developing them. the challenge is to do it from the established curricular subjects
Educational mathematics is developed in three or four subjects of each training curriculum, and has to embrace achieving the teacher's competence development to teach school mathematics and also, the purpose of working on the SDG, how can we do it?
Relevant answer
Answer
  • asked a question related to Mathematics
Question
4 answers
using BTE how do we get mobilities and conductivity ,more calculation(mathematics) oriented answers would be helpful.
Relevant answer
Answer
Found this useful,
Refer to chapter 1(Low field electron transport) of Rode's book 'semiconductor and semimetals' . It has a thorough explanation for mobility and conductivity calculations.
  • asked a question related to Mathematics
Question
90 answers
In classical times there was a concept of pure science that was produced entirely in the intellect.
More recently sciences were developed by testing the intellectual product with empirical data. These sciences are not regarded as being pure.
Mathematics, often regarded as pure science, has for most of history been based on postulates of geometry that could not be proven. Then came relativity and other geometries. In the past century there was considerable effort to reformulate mathematics on a firmer basis of conditional sets. Math is now regarded as being somewhat more pure than before, while producing two generations of graduating students in some countries who are not able to do simple arithmetic.
Fortunately I had some excellent teachers who explained the two systems and why they were both needed. Other teachers displayed the Gödel's incompleteness theorems.
In academic settings there seems to be a difference of opinions about whether or not math is a science, and whether or not it is pure.
Is Mathematics A Science?
  • asked a question related to Mathematics
Question
3 answers
I am interested in TPACK and mathematics education, can you share recent research articles on both topics here?
Relevant answer
Answer
Of course Yes, give me a little time
  • asked a question related to Mathematics
Question
5 answers
Physical reality can be observed. At least part of the structure and behavior of physical reality is perceivable. Humans can communicate about these experiences. Curious humans want to comprehend these perceptions. Humans have designed linguistic tools to be able to communicate about the perceived structure and behavior of physical reality and with these tools, they have constructed structures and models of mechanisms that might explain the perceived structures and mechanisms that physical reality exposes. Some of these structures and models of mechanisms seem to be successful. People discuss the success of these approaches and call this activity exact science. Other humans discuss this activity and call themselves philosophers. Humans are interested in the structure and mechanisms of physical reality because this knowledge helps them survive as individuals and as communities. Part of the exact sciences is formed by mathematics. Mathematics contains structures and models of mechanisms that are not directly derived from perceptions of physical reality. These concepts are derived from abstract foundations. Examples are empty space and point-like objects. Scientists use these concepts to construct vector spaces, number systems, and coordinate systems. The scientists apply these higher-level concepts to construct a model of their living space. The philosophers will immediately indicate that it is impossible to prove that these models are correct. However, these models feature structure and behavior. If the structure and behavior of the models agree more with the perceived models and behavior, then there is a larger chance that the model fits reality. Since reality appears to be very complicated, little chance exists that good correspondence will ever end the dispute.
One of the aspects of the dispute concerns what the best inroad will be for comprehending most of the structure and the mechanisms of physical reality. That is the background of the posed question.
Relevant answer
Answer
The paper "Sticky Space Coverage" relies on the results of David Hilbert, John von Neumann, and Cantor. I consider them better and deeper-looking mathematicians than the EPR team. They all worked on set theory, vector spaces, and Hilbert spaces. Hilbert cooperated with Einstein on gravitation theory. The paper "The Standard Model of Elementary Fermions and the Hilbert Repository" ; https://vixra.org/abs/2106.0135 offers an explanation for the phenomenon of entanglement.
  • asked a question related to Mathematics
Question
5 answers
US Fed's balanced sheet has recently doubled up from $4T to $8T (see the monthly chart) – not to mention it used to be $800B around 2008. It seems like to me, that is highly inflating the housing markets, pushing the housing prices higher as well as the inflation rates higher – regardless of taking economic productions much into consideration. Fed refers to the situation as "transitory".
I'm sure that there should be solid mathematical rations behind it. Does this parabolic Quantitative Easing approach a mathematically and/or economically sound strategy, considering the current economic situations? Any other alternative strategy? Any upsides and downsides?
Thank you!
---------
PS:
A bit outdated visual components of Fed's balanced sheet:
Relevant answer
Answer
From the perspective of monetary system stability it is ( ), so I'm supposing that provides a mathematical justification.
But that's not the only perspective to be looked at in my opinion. The question also needs to be asked where all that money went to. Since debt is bought on the financial markets by the central banks I'm supposing most of the money is going to investors and investment funds. How much of it is then used to contribute to something which is beneficial to our society? What are the effects on inequality?
  • asked a question related to Mathematics
Question
3 answers
Dear colleagues, I would like to know if there is a mathematical equation or model to calculate the Soxhlet number of cycles by varying the following parameters:
- the type of solvent
- the volume of the extractor
- the temperature of the solvent heating
if yes how can we apply it? and how much uncertainty it has?
thank you so much
best regards
Relevant answer
Answer
Suggested reference: D.A. Ellis, "Prediction of multistage solvent extraction operation from limited data", Industrial and Engineering Chemistry, 52(3) March 1960, 251-252.
  • asked a question related to Mathematics
Question
6 answers
I need mathematical formula to measure public service quality and organizational impact
Relevant answer
  • asked a question related to Mathematics
Question
5 answers
such as Fourier , Hilbert or Laplace transforms in order to analysis and studies in the field of music acoustics.
Relevant answer
Answer
You my see
1-Transform methods in applied mathematics: An introduction
Wiley-Interscience
Peter Lancaster, Kestutis Šalkauskas
Year:
1996
Language:
english
2-Integral transforms in applied mathematics
Cambridge University Press
John Miles
Year:
1971
Language:
english
  • asked a question related to Mathematics
Question
1 answer
Hi researchers,
I need to find a method of proving a mathematical equation that exist in attached file.
This mathematical equation is about Bessel function.
I will be thankful to hear your helps and advises.
Relevant answer
Answer
This link might be useful, have a look:
Kind Regards
Qamar Ul Islam
  • asked a question related to Mathematics
Question
2 answers
Dimensional rules for Homogeneous Diophantine equations
A Diophantine equation is an algebraic equation with several unknowns and integer coefficients. Those are equations whose solutions must be whole numbers. The only solutions of interest are integers
In mathematics and physics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it or the minimum number of sides to build a physical area or volume.
To build a geometrical rectangle (square) we require 2 orthogonal sides (x, y are independent indeterminates) area = x*y (or area = x*x)
To compute a numerical square (square number) we require 2 numbers p and q coprime with gcd(p,q)=1 or independent numbers.
Let we introduce a dimension for nature of numbers like I (for integer), R (for real), C (for complex) and so on.
n^2 = p^2 +q^2 ; 5^2=3^2 +4^2
Dimensional analysis gives for n^2= p^2 +q^2
I*I =I*I +I*I ; The sum of square might be equal to a square in some conditions.
Then the equation n^2 = p^2 +q^2 may have integer solutions.
A dimension is anything we can independently adjust, it is based on some geometric or algebraic definition.
In any correct mathematical equation representing the relation between physical quantities or mathematical objects (length, area, volume,….,.simplex), the dimensions of all terms must be the same on both sides. Terms separated by ‘+’ or ‘–’ must have the same dimensions.
The degree of freedom is the number of free components : how many components need to be known before the « objects » is fully determined?.
For example:
- a point in the plane has two degrees of freedom : its two coordinates;
- a square has two degrees of freedom : its two sides ( length and breadth).
- A point in 3-dimensional space has three degrees of freedom because three coordinates are needed to determine the position of the point.
Law of Degree of Freedom
The degree of freedom of a Diophantine equation is the number of parameters of each side that may vary independently. The degree of freedom must be the same on both sides.
- The equation n^2= p^2 +q^2
LHS is a square number with two degrees of freedom (its two multipliers or components) .
RHS is a sum of two squares with two degrees of freedom p^2 and q^2 which vary independently.
The degree of freedom is defined as the dimension of a mathematical object. When the degree of freedom is used instead of dimension, this usually means that the object is only implicitly defined.
Attempt to answer to Hilbert 10th problem
Hilbert's Tenth Problem Given a Diophantine equation with any number of unknown quantities and with rational integral numerical coefficients: To devise a process according to which it can be determined in a finite number of operations whether the equation is solvable in rational integers.
The problem was solved in 1970 by Yuri Matiyasevichwho in his doctoral dissertation proved that a general algorithm for solving all Diophantine equations cannot exist.
I think the concept of dimensional analysis is an attempt to answer Hilbert 10th problem related to homogeneous Diophantine equations . It works very well and allows to know if a homogeneous Diophantine equation has integer solutions but it remains to calculate these solutions using modular arithmetic or algebraic method…. The most important thing is to answer Yes/No and affirm that the integer solutions exist or not.
Relevant answer
Answer
Hello A.H Sheikh,
The question is very clear. Can we use dimensional analysis for Diophantine equation?
1/x+1/y =1/z with x, y, z integers.
x^2 + y^2 =z^2 with x, y, z integers
1/x^2 + 1/y^2 = 1/z^2 with x, y, z integers
1/x +1/y =1/z (called optic equation) which has integer solutions (2,2,1), (4,4,2)…..
The physical interpretation shows this equation is used for distances in thin lens equation (1/d1 + 1/d2 = 1/f ) , (1/L + 1/L= 1/L dimensional equation is correct)
electrical engineering (1/R1 + 1/R2 =1/R3).(1/R + 1/R= 1/R dimensional equation is correct)
1/x^2 + 1/y^2 = 1/z^2 (in a right triangle) with x, y, z integers has integer solutions (15,20,12), (20,15,12) ,(80, 60, 48),….
In the right triangle we have the equality 1/a^2 + 1/b^2 =1/h^2 where a and b are the integer sides of the right triangle and h the integer altitude to the hypotenuse (geometric interpretation (1/L^2 + 1/L^2 =1/L^2 dimensional equation is correct)
If the dimensional equation is right, correct then the Diophantine equation has integer solutions.
Greetings
M.AZZEDINE
  • asked a question related to Mathematics
Question
6 answers
Dear Community,
I want to center (subtract the mean) my data in order to lower my intercept (as close as possible to zero). However, as I have categorical data as well, which I don't know how I can possibly center, I can't seem to lower my intercept.
And the thing is that my dummy variable drive up the intercept... So I don't know to fix the issue.
When I enter only continuous variables that are centered, the intercept is close to zero.
I thank you in advance?
Relevant answer
Answer
Not sure why you want the intercept being zero, but one way you could easily achieve this is by first finding the (non-zero) intercept and the subtract this value from the response variable.
  • asked a question related to Mathematics
Question
2 answers
I am combining fish abundance and biomass data collected from five locations which have utilised different transect dimensions:
15 x 4 m (60 m2; from one location)
30 x 5 m (150 m2; from three locations)
50 x 4 m (200 m2; from one location)
When pooling data collected from transects of differing sizes, should you standardise your data down (to the smallest dimensions) or up (to the largest)? Or in this case, perhaps standardise according to the most commonly used dimensions (30 x 5 m/150 m2)?
To me it seems as though there would be no difference, but I was wondering if there was some sort of mathematical explanation for why one way might be preferable over the others?
  • asked a question related to Mathematics
Question
28 answers
Dear Colleagues!
I hope you are all doing well. I have a question to all of you. I love to teach and so far I have been teaching everything from international business, marketing, management to organisational psychology. I feel ambivalent towards this however.I love to teach and Im curious in my nature and what better way to learn new things than to teach? However I also feel that if I continue being a generalist It might also be bad since I risk loosing touch with my main specialisation.
What are your thoughts? Your experiences?
My speciality is this :
Best wishes Henrik and professor Hugo 3 months old who keeps me company when Im trying to work :-)
Ps stay safe.
Relevant answer
Answer
Teaching one subject is more scientific and it will give you more academic background.
  • asked a question related to Mathematics
Question
3 answers
I have seen that some equation sets have an explicit way of defining the substrate consumption whereas others have an implicit way. I would like to know how to convert the former into the latter.
For instance, in the attached file, it can be seen that there are two ways to describe the growth of bacteria.
In the first (explicit), the presence of a half-saturation constant suggests that the model is a Michaelis-Menten case. The second is straight a logistic model.
I was wondering if I can convert the first into the second, that is explicit to implicit.
Considering that the Monod term says that
μ = μᵢ[S/(S + K)]
then I can write
Ṅ = μN * logistic term
My question is: Would this modification be mathematically and biologically sound?
If yes, how can I estimate the carrying capacity? For instance, if I know the amount of limiting substance, can I estimate the number of cells that a system can sustain?
Thank you
Relevant answer
Answer
You will be best judge I think . There are so many model papers of logistic regression on Michales Menten equation - https://www.youtube.com/watch?v=fv6OAVe2vQc
  • asked a question related to Mathematics
Question
4 answers
I'm working on constructing a field based on finite undirected and unlabeled graphs. I've selected graph join and graph Cartesian product. But I'm trying to figure out if the latter distributes over the former (or simple graph union).
  • asked a question related to Mathematics
Question
5 answers
I want to know how we can relate magnetostriction with Applied magnetic field mathematically? Or if there is any way to derive it using mechanical equations?
Relevant answer
Answer
There are some classic thermodynamic models to discuss the influence of an external magnetic field on magnetostriction. And we can discuss the influence of external magnetic field on magnetostriction in ferromagnetic materials with different initial stress states.
【1】Shi Pengpeng. One-dimensional magneto-mechanical model for anhysteretic magnetization and magnetostriction in ferromagnetic materials. Journal of Magnetism and Magnetic Materials 2021, 168212. https://doi.org/10.1016/j.jmmm.2021.168212
  • asked a question related to Mathematics
Question
5 answers
Hi All,
Can anyone please tell me which mathematical equation can be used to normalize the single ion monitoring quantitation in GC-MS? Thanks in advance!
Relevant answer
Answer
Nice question
  • asked a question related to Mathematics
Question
7 answers
The field equations originally starting as Maxwell distributions graphs configure a velocity variable. Understanding that in connection to wave theory requires a mathematical transformation of velocity variable into wave function parameter. This may help mathematically to define particle wave quantum relativity quantitatively. Legendre transform theoretically will have a way to provide link among functionality of parameter-variable systems.
Relevant answer
Answer
Dear
One paper for you
  • asked a question related to Mathematics
Question
10 answers
There is a contradiction between the natural width of the energy transition, which is determined by the lifetime at the corresponding energy level and the spectral line width of the radiation line, which is determined by the duration of the wave train.
For example: For the Mössbauer transition, whose lifetime is of the order of 2 years, while the interaction time at the receiving end is about 10^(-10) sec.
Mathematically, this interaction is expressed by the Feynman diagram of the electron - electron interaction, which integrates over the internal photon line, which, together with the delta functions of the vertex parts, limits the photon spectrum.
By the way, the same paradox applies to any other type of collision.
So, is exist (really) the electromagnetic field?
Relevant answer
Answer
Dear Pratik,
dissatisfaction with quantum theory, among physicists, lies in the fact that it, like any statistical theory, does not allow describing the dynamic processes of individual physical objects. The only physical substantiation of quantum theory is that the exchange of energy between objects occurs (according to Max Planck) in portions of the integer Planck action per oscillatory cycle.
Thus, the phase space of coordinates / impulses (time / energy) is divided into cells, inside which any processes can occur without violating the Planck prohibition (the classical model of the hydrogen atom), and at the border between the cells, the Fourier transform degenerates to the zero component. The space of classical c-numbers is partitioned into symmetric and antisymmetric components. It is possible that this corresponds to splitting the wave functions into even and odd parts (fermions and bosons).
Thus, the task is to construct an internally consistent building of classical mechanics that is compatible with the quantum theory, taking into account the properties of symmetry and interaction parameters.
  • asked a question related to Mathematics
Question
6 answers
When we derive the formula for length contraction, we use the direct Lorentz transformation. But for solving the formula for time dilation, we use the inverse transformation. Why is that so?
Relevant answer
Answer
  • asked a question related to Mathematics
Question
7 answers
A question from far away worlds...Life Sciences (cricket) and an hyperbolic function from history of mathematics are trivially juxtaposed to encourage whatever reply.
[The antennas of the cricket roughly complete the less frequently represented branches of the hyperbola in the photographed virtual third and fourth quadrant of the Cartesian coordinate system].
Relevant answer
Answer
Great correlation ! in picture . please go through one of the special aspects of compuational epidemology -https://www.researchgate.net/post/How_best_fit_regression_method_can_be_applied_to_model_SARS-COV-2_epidemology
  • asked a question related to Mathematics
Question
5 answers
Here we discuss about one of the famous unsolved problems in mathematics, the Riemann hypothesis. We construct a vision from a student about this hypothesis, we ask a questions maybe it will give a help for researchers and scientist.
Relevant answer
Answer
Juan, the easiest ways (in my opinion) are:
(i) From the connection with the Bernoulli numbers, we have that: (2n+1) ζ(-2n) = B2n+1 , where the right hand side are the (2n+1)-Bernoulli numbers - and the latter are zero;
(ii) From Riemann's functional equation, we have: ζ(-2n) = -2-2n (2n)! π-2n-1 ζ(2n+1) sin (nπ), and the latter factor equals 0.
  • asked a question related to Mathematics
Question
3 answers
They say the best educators are able to make a complex subject easily understood by a child. Perhaps this is a challenge to us all.
Quarternion mathematics can be quite complex to wrap your head around. For educators out there how are you explaining this to your students from high school.
Is a pictorial method the most appropriate under these circumstances.
Relevant answer
Answer
Hey Joseph,
In my opinion sticking with unit quaternions would be the way to go. At a high school level it may be a good idea to skip the complex math definitions and instead focus on the intuitive "definition" of a unit axis and a rotation about that axis. Depending on the context you could run through an animation/example in 2D or 3D to show how multiplication works, then give the multiplication rules as formulas -- the same way one might do for dot and cross products at the high school level.
I would guess another important question to answer is why a roboticist would use quaternions instead of other representation. Having a short discussion on gimbal lock could be a great motivator, especially if there audience is interested in aerospace applications or robotic arms.
Thanks,
Logan
  • asked a question related to Mathematics
Question
37 answers
I have read that time is defined in terms of entropy (entropy of the universe maybe? I'm not sure). But entropy is a macroscopic quantity which makes time a macroscopic quantity. Yet time is a parameter in Schrodinger's equation. So we have a macroscopic quantity appearing in a microscopic equation. That makes me think that this microscopic equation is really a statistics equation. It produces deterministic solutions but maybe these deterministic solutions are just mathematical procedures for statistical calculations. That would be consistent with the fact that these solutions actually are used for statistics calculations. Does it makes sense for a macroscopic quantity (time) to appear in a microscopic equation, unless it is a statistics equation? Or, am I mistaken in calling time macroscopic? My primary question is whether Schrodinger's equation can be derived from some set of statistical postulates. The question is not whether the equation was historically obtained from statistical arguments (we already know it wasn't), the question is whether the same equation can be derived from statistical arguments. What Schrodinger was thinking at the time of producing his equation is not relevant to this question.
Relevant answer
Answer
Interesting, I still remember that my QM physics teacher in Moscow told us in a lecture that the SE came from a more general theory. I just found this on a Wikipedia commons article that remains me of what he said in 1990:
I always have been impressed more with the old quantum method of quantization that the same SE, systems such as superfluidity in He4 can be predicted by the old method quite nicely.
  • asked a question related to Mathematics
Question
9 answers
Mathematics is the basis of exact sciences. The development of mathematics consists in the fact that, among others, new phenomena of the surrounding world, which until recently were only described in the humanistic perspective, are also interpreted in mathematical terms.
However, is it possible to write down the essence of artistic creativity in mathematical models and create a pattern model for creating works of art, creative solutions and innovative inventions? If that was possible, then artificial intelligence could be programmed to create works of art, creative solutions and innovative inventions. Will it be possible in the future?
Do you agree with my opinion on this matter?
In view of the above, I am asking you the following question:
Will mathematics help to improve artificial intelligence so that it will achieve human qualities of artistic creativity and innovation?
Please reply
I invite you to the discussion
Best wishes
Relevant answer
Answer
Dear Stan Sykora, Boris Pérez-Cañedo, Baidaa Mohammed Ahmed,
Thank you for answering the above question and participating in this discussion.
Regards,
Dariusz Prokopowicz
  • asked a question related to Mathematics
Question
1 answer
what are other possible ways to convert a CW laser to a pulsed laser. Please give all the theoretical and mathematical details.
Relevant answer
Answer
Output optical power can be achived by optical phase shift in one arm of Mach Zehnder interferometer. π/2 phase shift will lead to destructive interference and lower values of output intencity.
If we consider integrated structure of silicon Mach Zehnder modulator, the phase shift is induced by changing electron and hole concentration along with the effective refractive index.
The attached picture represents output power equation of MZM with a phase shifter in one arm. Indices 1 and 2 corresponds to MZM arms with and without the phase shifter. Index 3 denotes the phase shifter itself. L - length, betta - propagation constant, alfa - absorption coefficient.
  • asked a question related to Mathematics
Question
4 answers
Hello Experts,
I want to know that how to find theta maximum when i am using GPS and sphere and surface type distribution. and using cosine distribution.
then i want to know that is there any mathematical calculation to find theta maximum for biasing.
like in the Geant4/examples/advanced/radio-protection theta maximum is 0.003 deg. how they got this using the surface area of source or object. like how can i get for my object ?
any type of help will be appreciated.
Thanks in advance !
Best Regards
Priyanshu
  • asked a question related to Mathematics
Question
2 answers
How to transfer the logical description of safe constraints to mathematical description?Any feasible idea?
Relevant answer
Answer
The following work maybe useful
  • asked a question related to Mathematics
Question
12 answers
  • An understanding of theories about how people learn, and the ability to apply these theories in teaching mathematics; It is one of the primary requirements for effective teaching of mathematics, and a large number of scientists have studied mental development and the nature of learning in different ways, and this resulted in various theories of learning.
Relevant answer
I totally agree with Darren John Stevens, I consider that it is a precise and detailed reflection, as well as current and fundamental for the time that we are having to live! Many thanks.
  • asked a question related to Mathematics
Question
11 answers
Question about the loss of hyperbolicity in nonlinear PDE: when complex eigenvalues appear, what is the effect on flow? I understand that we do not have general results on existence in this case, but is it only the mathematical tools that are lacking where can we show physical phenomena of instability?
Relevant answer
Answer
  • asked a question related to Mathematics
Question
2 answers
Different longitudinal studies, such as the Perry Preschool Project or the Abecedarian Project, have shown that early and effective exposure to different content in ECE students, as science or maths, cause positive effects in children later development not only in academical sphere, but also in personal, social and economic ambits.
Relevant answer
Answer
There is little interest in teaching children about science due to the many difficulties in this field. Among them
1- Indicators of learning difficulties related to language
The child's speech is delayed compared to his peers.
Limited vocabulary.
Problems with forming sentences, finding words, and using and using language appropriately.
2- Indicators of learning difficulties related to cognitive skills
Poor to follow directions or follow a daily routine.
Slowness in saving and retrieving information - when needed - such as memorizing colors and days of the week.
Forgetting thoughts while talking and not remembering the topic the child is talking about if someone interrupts it.
Problems with motor coordination (eg, jumping, undressing, buttoning, tying shoelaces).
Difficulty finding similarities and differences between different stimuli.
Problems with visual-motor coordination, represented by the child's inability to achieve coordination between hand and eye movement, and he cannot arrange beads, cut correctly, or follow a line while writing.
3- Indicators of learning difficulties related to attention
Moving from one activity to another without the child finishing his previous activity.
Having difficulty following the child to what he hears or sees.
Short attention span of the child, and distraction.
There is a problem with the child following the sequence of information or ideas.
  • asked a question related to Mathematics
Question
4 answers
Hi all,
I attached an image file of excel data in which the problem is to predict the value of u by using any mathematical method.so, please share me the procedure or method to be followed to solve the problem.thank you in advance.
Relevant answer
Answer
You search data imputation in internet there are many tools to predict the missing values.
  • asked a question related to Mathematics
Question
4 answers
Although there is a reasonable dose of physical and geometrical interpretation of the mathematical formulas and equations, more work is needed to bridge the gap between the theory of mathematics and its applications. For example, let us look to the coplanarity of three vectors, which are typically expressed as a dot and cross products between the three vectors. Based on practical feed back, when the explanation of the coplanarity is broken down into cross product first to generate a perpendicular vector and then then do the do product with the third vector, which is now expressed an orthogonality relationship between two vectors a deeper understanding can be achieved by the students. Indeed more class work is required to take the students through this journey using a step wise approach. I do believe that the teaching of mathematics to engineering students should go to a deeper physical interpretation to facilitate its comprehension and understanding. Your comments are highly appreciated.
Relevant answer
Answer
I still remember with pleasure the amount of mathematics, with physical and geometrical interpretations, used in the (Rational) Mechanics course - when I was a student:
  • Statics, the study of non-moving bodies under known loads, how forces affect static bodies;
  • Dynamics, the study of how forces affect moving bodies. Dynamics includes kinematics (about movement, velocity, and acceleration) and kinetics (about forces and resulting accelerations);
  • Mechanics of materials, the study of how different materials deform under various types of stress;
  • Fluid mechanics, the study of how fluids react to forces;
  • Kinematics, the study of the motion of bodies (objects) and systems (groups of objects), while ignoring the forces that cause the motion. Kinematics is often used in the design and analysis of mechanisms;
  • Continuum mechanics, a method of applying mechanics that assumes that objects are continuous (rather than discrete).
  • asked a question related to Mathematics
Question
3 answers
Hi all, I am looking for a patterning assessment to use as a pre- and post-test alongside a patterning intervention in mathematics for 7 to 9 year old children.
I know of PASA by JT Mulligan, are there any others?
Thanks in advance for your help!
Relevant answer
Answer
I hope the following is useful !!
Assessment of Young Children from Culturally Diverse Backgrounds: A Journey in Progress
Notari-Syverson, A., Losardo, A., Young Sook Lim,
Journal:
Assessment for Effective Intervention
Year:
2003
  • asked a question related to Mathematics
Question
4 answers
The gyroscope is quoted as a mathematical gyroscope, that is, the intersecting lines of the equator and one meridian. The permissible movements of our mathematical gyroscope are the proper rotations of the equator and meridian circles and the rotation of the entire structure around the axis passing through the intersection points of the two circles. Since the proper rotations of the circles are specified by the group of diagonal matrices with complex units, and the rotation of the entire structure is specified by the group of special orthogonal matrices, it is expected that the group of motions of the mathematical gyroscope generated by these groups is equal to the unitary group U(2).
It is clear that this construction has a generalization in the form of a mathematical gyroscope of the n-dimensional sphere, which generates the group U(n). Does this construction find application in phenomenological theories of gauge symmetries?
Relevant answer
Answer
It should be added to the above that the unit hypersphere of an 8-dimensional space with a neutral metric is homeomorphic to the product ℝ4×S3. Therefore, if the unit hypersphere is orthogonal to the vacuum vector field of accelerations of matter in 8-dimensional space with a neutral metric, then the geometry of the unit hypersphere corresponds to the geometry of the vacuum. In turn, the geometry of gauge symmetries S3×S2×S1 is specified by the geometry of an isotropic surface in a 7-dimensional section (obtained by fixing time) of a compactified space with a neutral metric.
  • asked a question related to Mathematics
Question
6 answers
I am looking at glacier change in the Andes. I am using SPSS for my statistics. I have been provided with discharge data also, for which I would need to look for a relationship between glacier area, temperature, and river flow over a specific time period of 7 years. Temperature is given in daily minimum/maximums, river flow is monthly, and area change is yearly. Thanks :)
Relevant answer
Answer
Yes, Daniel Wright, at least partly. But I was also trying to understand whether there are explanatory and outcome variables versus simply looking at associations among the 3 variables.
  • asked a question related to Mathematics
Question
12 answers
More specifically I am looking to analyze and plot non-michaelian kinetics based on functional parameters from BRENDA or similar sites. I do not know how to find the mathematical function describing such kinetics and have not yet been able to find it in the literature.
I would greatly appreciate any help from the community!
Relevant answer
Answer
Michael - are you looking to check for a pre-defined function to fit your data; or, given your data, you would like to build a function that fits your data?
  • asked a question related to Mathematics
Question
2 answers
Dear colleagues, what do you think of a possible mathematical analogy between a one-sided surface and a Bose-Einstein condensate?
Relevant answer
Answer
Yes, dear Narasim Ramesh, but not only this. For example, one can consider the behavior of a superfluid liquid on the surface of a Mobius strip or a Klein bottle.
  • asked a question related to Mathematics
  • asked a question related to Mathematics
Question
5 answers
Why CPW square slot antenna gives a wide impedance bandwidth?
Is any mathematical derivation/equation is available for it?
Relevant answer
Answer
Kapil Saraswat please share your paper
Thank you
  • asked a question related to Mathematics
Question
6 answers
Hi everyone! Greetings from Munich!
It appears in my mediation analysis, that X is negatively related to M, and M is positively related to Y. Also, i find a significant negative effect of X on Y through M. But since M is determined as a perceived benefit, i am currently struggling with the interpretation of this indirect effect.
Mathematically, of course, this indirect effect result makes sense since "- x + = -", but can i interpret this by saying the benefit is overridden or is it rather that the benefit "backfires" on Y and thus a negative indirect is found?
Many thanks in advance!
Relevant answer
Answer
Check out my paper in Journal of Marketing Research where we talk and show empirically how these mediating effects occur in the context of benefits based choice.
  • asked a question related to Mathematics
Question
8 answers
Pursuing research in mathematical science through physical problem-solving is an art. More students of science and engineering can be attracted to learn mathematics in the process and apply the mathematical tools in solving real-world problems.
Relevant answer
Answer
Most of the students believe that the theory they study is only used for scoring because of which a low-scoring student is looked upon as having less capability of becoming a researcher. In fact, the truth is that (in most cases) he is equally capable of conducting quality research compared to a high scoring-student but they get less chance because of their scores.
However, students realize the significant use of the theory only when they have to appear for an entrance or they need to present something on the topic. Conducting classes with an approach of explaining the importance of the theories in real-life along with giving them tasks during which they could put an effort to explain or relate what they have studied with the real-life problems can help in drawing their interest more towards research as it will also increase their curiosity and confidence in exploring the world of mathematical sciences.
  • asked a question related to Mathematics
Question
41 answers
We consider an equilateral triangle ABC with circumradius 1 and a point D on or inside its circumcircle. Prove that 3 ≤ AD + BD + CD ≤ 4.
Relevant answer
Answer
Peter, we still need the minimum when D is on the circumcircle and the min + max when D is inside the circumcircle.
  • asked a question related to Mathematics
Question
4 answers
Nonlinear mixed-effects models (may) consider data below the limit of quantification (BLQ) in parameter estimation. However, an evaluation of the goodness-of-fit plots (observations vs predictions in particular, using spline interpolation), displays a strong trend (of spline interpolation, but not of the data) in the region of censored data, as if the model disregarded BLQ data and the data were the lower limit of quantification itself, as structured in the database. I believe that the database is structured correctly and that the model considered the censored interval. Apparently this plot is the only one to exhibit this behavior.
Is spline interpolation adequately representing the competence/capability of the final model in this case? How to handle this situation?
Relevant answer
Answer
Interpolation can be thought of in two ways:
1) Interpolation methods approximate some underlying model
2) Interpolation simply approximates a set of numbers continuously
In case 1), interpolating will capture the essence of the underlying function, if and only if, the data is representative of the fundamental model. Noise will definitely throw your results off.
In case 2), you are simply generating an approximation from a set of known numbers, e.g. Lagrange interpolation; forward, centered and backward Newtonian interpolation, &c. The numbers in hand may or may not represent anything in particular, or, they may not be accurate enough to enable one to gleam the underlying processes. Purely interpolated results can and do grow wild as the power of interpolation is increased.
What I suggest is a low power interpolation of the database, then look at the curve and compare to any model you have in mind. If the interpolated results resemble strongly enough some model, then you may further pursue investigating along that vein.
  • asked a question related to Mathematics
Question
7 answers
I'm looking for referents / references about how/if learning mathematic language prior to grammar impacts comprehension ad interpretation abilities.
Another route but similar purpose, is to understand if enhancing adults' skills on mathematical language understanding can have any impact on the development of their speaking and writing skills.
Does anyone know of any studies, papers around this?
Thank you!
Relevant answer
Answer
Impacts of a Prekindergarten Program on Children's Mathematics, Language, Literacy, Executive Function, and Emotional Skills
Weiland, Christina, Yoshikawa, Hirokazu
Journal:
Child Development
DOI:
10.1111/cdev.12099
Date:
November, 2013
  • asked a question related to Mathematics
Question
5 answers
Let T denote the circle group, that is, the multiplicative group of all complex numbers with absolute value 1. Let f : T → T be a (sequentially) continuous map, and such that f(z2 ) = f2 (z) for all z ∈ T. Then there is an integer k such that f(z) = zk for all z ∈ T.
Relevant answer
Answer
I submitted this problem to, and was recently published in, the Mathematics Magazine. Even if you submitted a solution to the journal, and because the deadline for receiving solutions expired, please post your solution here as well.
  • asked a question related to Mathematics
Question
3 answers
Is there any mathematical equation to determine the appropriate number of hidden layers for a sequential model?
Relevant answer
Hi Hasintha, It's a practical problem and you should make decision about number of hidden layers by checking accuracy of the fitted model.
  • asked a question related to Mathematics
Question
7 answers
I shared the picture of three parameters 1.Change in Temperature, 2. Change in Relative Humidity, 3. Change in Pressure and respective error value for that.
From the attached data(picture and excel file attached), I need to find the Error value for different input parameter.
If
1.Change in Temperature = 1°C
2. Change in Relative Humidity = 1%
3. Change in Pressure = 1mbar
What is the error value?
If
1.Change in Temperature = 2°C
2. Change in Relative Humidity = 2%
3. Change in Pressure = 2mbar
What is the error value?
If
1.Change in Temperature = 4°C
2. Change in Relative Humidity = 3%
3. Change in Pressure = 2mbar
What is the error value?
Is it possible to find the error value by mathematics. Please tell the way to calculate using calculator or python programming.
Relevant answer
Answer
To Hanan Mahmood: trapezoidal rule and Simpson's rule are Numerical Integration Methods.
  • asked a question related to Mathematics
Question
4 answers
In literature two formulae are generally used for evaluating Gravimmetric power density (Pd)
1. Pd (W/Kg) = Energy density (Whr/kg) x 3600/ discharge time (s) and
2. Pd (W/Kg) = [106 x V2]/[4 x ESR (Ohm) x mass (mg)]
But it has been found that each equation gives different result for any known value of current density. What may be the reason for it? Which equation is to be used for determining the power density of two electrode supercapacitor?
Relevant answer
Answer
Dear M. K. Dey
In my personal opinion, there is no point to coincide with the Power density values from GCD or EIS.
The power density value from the first equation depends on the energy density calculated from GCD. (It seems more reliable)
Whereas, power density calculated from the second formula depends upon the characteristic values from the EIS.
For further details of the calculations, you can see this article
  • asked a question related to Mathematics
Question
8 answers
is there a deeper fundamental property of neutrino oscillations? How does it work at the field level? is there any advanced mathematical connection or is only a physical fact?
Relevant answer
Answer
I have a more simple view on the neutrino:
IMO the neutrino is a simple particle with a very weak interaction with matter. This weak interaction gives rise to only a few possible interactions in specific circumstances giving rise to neutrinos with different mass, i.e. there is only one type of neutrino but with different masses according to the interaction which created it.
As far as I know, the neutrino doesn't travel at light speed and, it doesn't follow the mass law "m=m_o gamma".
JES
  • asked a question related to Mathematics
Question
3 answers
I designed and made a rotary atomizer with the help of 3D printing. Now, in order to evaluate its performance, I want to measure the diameter of the produced droplets. According to mathematical calculations and theory, the diameter of the droplets is about 100 microns and I want to measure the diameter experimentally.
Please help me in this way how to experimentally measure the diameter of a drop that is produced continuously.
Best regards,
Relevant answer
Answer
I think the most straightforward (and intuitive) way is what Amit suggests. A good imaging setup (bright light source, and good contrast) will resolve the problem. Regarding the distribution, the image processing of the captured images (depending on your image quality, it may be super easy or super difficult) provides you with the distribution of the droplets. I use a similar procedure for measuring the diameter and distribution of bubbles departing from a boiling surface.
Thanks,
Shayan
  • asked a question related to Mathematics
Question
4 answers
Hi everybody,
Maybe a stupid question, but I forgot how to calculate such things. Let's say I have a group of 200 elements (genes). I want to divide this group into n subgroups, each containing 10 elements. However, each element should be present in more than one subgroup. Is there a cool formula to calculate n depending on the number of times each element should be present in independet subgroups?
Thanks,
Johannes
Relevant answer
Answer
I think you meant set not group! cuz groups are sets with binary operation with 4 axioms (asscoiativity, identity, inverse, and closed operation)
Now, If you have 200 elements and you wanna compute how many subsets with 10 elements you can make, follow this formula
n=200×199×198×....×191÷(10×9×8×...×2)
  • asked a question related to Mathematics
Question
8 answers
I'm solving differential equation.
u'(x) = a11(x)*u(x) + a12(x)*v(x)
v'(x) = a21(x)*u(x) + a22(x)*v(x)
or simply, U'=AU.
Given A(or, a11/a12/a21/a22) as a function of x, i want general solution for u & v.
Solution for constant A is already known, using matrix-exponential.
But this case, this is for given matrix A as a function!!!, and I found out that the same approach is not valid by my hand.
Hope any keyword or references to go further....please.
Relevant answer
Answer
Your system is a nonautonomous dynamic system.
You can find the general solution directly. Using the exponential of A(x)
the method works even the matrix includes a variable x.
See the attached article; I hope you will find it useful.
Best regards
  • asked a question related to Mathematics
Question
4 answers
I am conducting research about Students' Perceptions on Face-to-Face and Online Mathematics Learning. One of the statements of the problem in this study is to determine if there is a significant difference on the students' perceptions between face-to-face and online mathematics learning. I will be using the Independent T-test in hypothesis testing. Now, I am struggling on what data should I use especially for the mean and n. My survey questionnaire consists of 20 items (10 items for perceptions on face-to-face learning and 10 items for online learning). I already gathered the data and calculated the weighted as well as the grand mean of both learning mode. Can I use the grand weighted mean as mean for hypothesis testing using Independent T-test? What could be the value I use for n? I have 84 respondents. If I use the weighted mean, the n would be 10 because it would be based from the items (each learning mode) in survey questionnaire. Please help me and thank you for responding!
Relevant answer
Answer
Margie Lou Peresores Are these new items that you created? If so, I would first conduct a factor analysis with these data to assess the reliability and validity of the items. For instance, there may be more than one dimension or factor being measured by the items.
Assuming the measure is validated and shown to be reliable, you'll want to conduct a paired samples t-test, not independent samples, to compare the grand means of each instruction modality - since it sounds like each individual answered questions about both instruction types.
Some folks here might caution you against conducting a t-test with means from ordinal items. An alternative approach is to conduct an ordinal regression with these data.
  • asked a question related to Mathematics
Question
13 answers
This is my very first encounter with functional equation of this kind, and methods of series solution and differential equations are of not much help. The solution to this problem, or at least the mathematical prerequisites to understand solution to this problem is asked.
This function is asymptotically zero at both +_ infinity, positive otherwise, and has a peak near zero.
If I am correct, then this is the frequency distribution of numbers fed to the sequence xn+1=a ln (xn2) as long as the sequence generated is chaotic and sufficiently large in number (value of a is usually limited to 0.2 to 1.3, Positive and negative signs of a are essentially immaterial except for the sequence is negated after first term) .The sequence is initiated or seeded with number roughly as the same order of magnitude of 1 in both positive and negative side, except for the values that eventually lead to zero or infinity in the sequence. The sequence is allowed to proceed, and frequency distribution of numbers in the sequence are noted, from which a continuous probability distribution may be numerically guessed but not analytically found. The expression to find out formula of the continuous probability distribution comes to me from the following reasoning
  • Suppose, the probability distribution is given by y=f(x). Now, if I consider a "dx" (infinitesimally) thin strip around x, then I come up with f(x) dx fraction of all points required to construct the probability distribution. When this fraction of all points are passed through yet another sequence of transformation through the recurrence xn+1 =a ln (xn)2 , the fraction of points involved must be unchanged. That is, when x is substituted with a ln x2 , the infinitesimal strip area, which changes to f( a ln x^2) d (a ln x^2), must be numerically equal to f(x) dx, thus the functional equation is postulated
  • I am not entirely sure about this reasoning, and experts are welcome to point out my fault of reasoning and show the correct equation , if I am mistaken.
Relevant answer
Answer
Truman, f cannot have constant sign - otherwise the left hand side of the functional equation will always be (strictly) positive, whereas the right hand side always changes signs when x varies.
  • asked a question related to Mathematics
Question
3 answers
Hi everyone. recently I designed a customized semantic segmentation network with 31 layers and SGDM optimation to segment plant leaf regions from complicated backgrounds. can anyone help me how to explain this with mathematical expressions using image processing. thank you
Relevant answer
Answer
I think the best way is to use the results of the semantic segmentation and samples of leaves from fieldwork to create your mathematical expression using any curve fitting mathematical tool.
  • asked a question related to Mathematics
Question
24 answers
I got confused when I plotted the graph of -(x^2 - x)^(2/3). the graph shows the function achieves its maxima at x =0 and x =1 but when we follow the procedure of derivatives then we get x = 0.5. Please help me in this.
Relevant answer
Answer
Vishal, in addition to Joachim's answer, note that the derivative of your function contains the factor (x2 - x)-1/3 , which shows that the derivative changes signs at both x = 0 and x = 1, yet the derivative dose not exist at these points.
  • asked a question related to Mathematics
Question
3 answers
I have the x,y data of two curves (solid red and blue in the attached image) and I want to find out the envelope function of the two (dashed magenta curve in the attached image). Is there a way to do it in Origin or Igor? Or in any other mathematical software for instance?
Relevant answer
Answer
Arani Biswas Deconvolution of a composite peak into its individual peaks plays an important role in the interpretation of many types of graphs including XRD, XPS, FTIR, and PL etc. In this video, I have discussed how to deconvolute simple combined peaks, composite peaks and how to correct missing data in a given peak with the help of deconvolution. In the case you want to further ask about it, please do comment on the specific video, I'll respond to it shortly. I have provided the practice files (OriginLab) here. Thanks
  • asked a question related to Mathematics
Question
2 answers
I want to integrate two carbon fiber materials together and want to model it mathematically considering the processes of joining the materials and the possible stress around the joints due to external loads.
I will appreciate if someone can recommend and the numerical methods which one is better suited for this purpose.
Thank you all in advance
Relevant answer
Answer
Assuming you have a strong join (no delamination issues etc.) then you have continuity of the displacement and the stresses across the join. However, strains will *not* be continuous across the join. The weak form of the elasticity equations will still hold, and energy minimization (for static problems) also holds. Using FEM, make the element boundaries conform with the join to avoid the problems of trying to approximate discontinuous functions (e.g., strains) with the discontinuity inside an element.
  • asked a question related to Mathematics
Question
3 answers
In the recent paper which has been exhibited in the 51th Annual Iranian Mathematics Conference entitled "Notes on maximal subrings of rings of continuous functions" we give some
properties of maximal subrings of some classes of subrings of C(X). However, we could not answer the following two important questions in this context.
1. Is every maximal subring of C(X) unit-free (i.e., whenever R is a maximal subring of C(X) and
f is an element of R with empty zero-set, then f is a unit of R)?
2. Is every maximal subring of C(X) uniformly closed (i.e., closed under uniform topology on C(X))?
I would be very delighted if you could let me your opinion about any ideas towards approaching the answers of these questions.
Relevant answer
Answer
It is not hard to see that for each real number t which is not algebraic over integers, C(X) has a maximal subring R_t which contains t but not t^-1, which immediately implies that the first question is not correct
  • asked a question related to Mathematics
Question
2 answers
I recently saw a question regarding the relationship between language and mathematical learning, but am interested in learning more about the opposite.
Can anyone recommend relevant readings that explore the relationship between mathematical ability/maths learning and language acquisition? I am primarily interested in second/foreign language acquisition, but also interest in first language acquisition and the relation to mathematics.
Relevant answer
Answer
I recommend for you to read: "Situated Learning: A Legitimate Peripheral Participation in Learning Mathematics in Public Schools"; Author: Zoncita D. Norman
  • asked a question related to Mathematics
Question
10 answers
Can you just assume a situation with no figures or data to back it ? Is it reasonable?
#Logic #mathematics #data
Relevant answer
Answer
I've met situations, in both mathematics and statistics, where geometrical representations were not necessary, not possible, or deceiving. An example, from mathematics, is given by the solution(s) of certain equations (e.g., of motion) that cannot be represented in explicit form: one can say a few things about their behavior, but "one can't see them" or "represent/graph them as functions". In statistics, certain regressions "cannot be seen geometrically", yet they have nice interpretations and their coefficients can be computed and interpreted very well. As for "deceiving", a lot of students have problems "seeing in 3 dimensions", e.g., the intersection between 2 solid bodies, even the intersection between a solid and a slant plane, etc.
  • asked a question related to Mathematics
Question
8 answers
As it is well known, Linked Opend Data (LOD) and computational ontologies have great success in the fields of Life Sciences (Biology, Medicine, etc). See e.g. the big LS-cluster at <https://lod-cloud.net/>.
However, I wonder why mathematics are – in comparison – covered only sparsely by ontologies or LOD.
Indicators (to the best of my current knowledge):
Probably there is some (machine-processable) formalization of mathematical knowledge but it seems almost disconnected from the "semantic web" and LOD-bubble.
Questions:
  1. Why is this?
  2. Should this be changed?
  3. If 2., how?
Relevant answer
Answer
Dear Carsten Knoll. I developed ThingFO two y. ago, so I'm not aware so far that other researchers used it for abstract mathematical concepts like polynomial or complex number as you are looking for. My interest in ontologies started in early 2000. At that moment, we developed a process ontology, and an ontology for metrics and indicators. In the last years we have harmonized semantically those ontologies with ThingFO in the context of the four-layered ontological architecture. Obviously that for indirect metrics and elementary and derived indicators, we use mathematical constructs (formulas, aggregation models), but that is all. These ontologies are specified at the low-domain level.
  • asked a question related to Mathematics
Question
6 answers
I need to write a MATLAB code that has the ability to process a GIS image in order to extract the coordinates of the grid points within the red region (R) and that are at least distance "d" from its boundary. Each point in the R is given a weight w1 (attached figure). The same procedure is to be made for the green region (G) but w2 is the weight of any point in G. The gathered data are saved in a matrix formed of three rows: row 1 contains the abscissa, row 2 contains the ordinate, and row 3 the weight.
I am looking forward to getting your suggestions...thanks in advance.
Relevant answer
Answer
im=imread('GIS.jpg');
%imshow(im);
BW = im2single(im);
numclust=5;
[L,Centers] = imsegkmeans(BW,numclust); % matlab inbuilt
temp_mask = L==1;
figure,imshow(temp_mask);
might help:)
  • asked a question related to Mathematics
Question
8 answers
Suppose we have a matrix relation as
A=Bn
where A and B are square matrices and n is a positive integer.
If A is know, how to calculate B? The can be easily calculated by MATLAB. We can get it as B=A(1/n). How to calculate it mathematically?
Relevant answer