Mathematical Definition and 1000 Threads

Hi all! I need help choosing math classes for a boy (who will be in the 11th grade, so two more years of math), who has taken AP Calculus BC and Intro to Linear Algebra, Proofs. I am thinking about taking MVC and DE. What other options might be good? He is doing AP Physics C both and preparing...

When doing the standard procedure for normalisation a wavefunction, I get $$|A|=\sqrt \frac{2}{L}$$ where A is the normalisation constant. It is mathematically correct to say that $$A=\sqrt \frac{2}{L} e^{i\theta}$$ but would this be a valid answer for the normalisation constant? In my lecture...

obtaining a mathematical model for a two wheels pushed tractor

Consider the following proof: My question is, does it in fact use induction? It says, "Assume now that the theorem is true for k-1 elements...," but I don't think it uses this assumption to prove that it is true for k elements, which would be an induction step.

From Blundell and Blundell Chapter 20 Problem 20.3. I have proved that $$1-e^{-\beta \omega}=2\sinh\left(\frac{\beta \omega}{2}\right)$$ with no problem, but I am stuck on the ##\coth## term. I have tried to solve this but it gets messy and I'd rather not include them here. Thanks!

Hello, This is my first post. For background, I have asked Ask The Physicist who has posted our correspondences and answers here: https://www.askthephysicist.com/ask_phys_q&a.html Search "My question is with regard to an apparent mathematical disagreement" or something like that to find the...

Hi. Now I am working on my term paper on "Influence of constructive elements of electric guitar on its sound" and faced with the task to build a mathematical model of instrument sustain. So far I have not found any good source that would help me with this. Now I have this formula: But I don't...

Let ##P(n)## be the statement that $$ F_n \text{ is even} \iff (3 \mid n) $$ Now, my base cases are ##n=1,2,3##. For ##n=1##, statement I have to prove is $$ F_1 \text{ is even} \iff (3 \mid 1) $$ But since ##F_1 = 1## (Hence ##F_1## not even) and ##3 \nmid 1##, the above statement is...

I have a BA in math. Took no physics courses. In the few years since I graduated I've self studied a lot of physics in my spare time and have a desire to pursue a formal education in it. I understand it would be almost impossible for me to get into a masters in physics unless I went back and...

I get that the bottom answer isn't a constant - but does this physically represent anything? When I set the two answers equal to each other, I get x = +- 1/sqrt(2) and I am wondering if this represents anything significant. I don't think (mathematically) there is anything wrong with the bottom...

TL;DR Summary: Why has format for mathematical expressions changed? The formula I am using as an example here is from classical physics so that is why I have chosen the classical physics forum. I have been running into a new format very different from what I have been used to for decades...

TL;DR Summary: new book with interesting problems There's a new book out by Routledge called Mathematical Conundrums with many interesting problems in algebra, arithmetic, route-drawing, and logic. Good for schools as algebra is no higher than high school. Challenging though.

Why do almost all people not think that neural networks are the mathematical model of intelligence? I briefly explain what I understand: -A neuron is a mathematical object that takes numerical inputs from other nearby neurons, applies a nonlinear function (combining the input with numbers...

I am attending University of Waterloo and my school will allow me to graduate as a Mathematical Physics major without taking any labs/experiment courses (in my school lab is not integrated to physics courses, they are separate courses with separate credits). This could be great because : -...

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I'm looking for an undergraduate-level 'mathematical methods' or 'engineering mathematics' book that uses SI units for the purpose of self-study. I've had my eyes on Zill's Advanced Engineering Mathematics, but it seems to use US customary units. So ideally I'm looking for a book that covers...

In page 67 of book "The mathematical theory of black holes" by S. Chandrasekhar in chapter 2 "Space-Time of sufficient generality" there is a theorem that metric of a 2-dimensional space $$ds^2 = g_{11} (dx^1)^2 + 2g_{12} dx^1 dx^2 + g_{22} (dx^2)^2$$ can be brought to a diagonal form. I would...

The Student's Manual simply applies l'Hospital's Rule n-times to arrive at ##\frac{e^x}{n!}\to\infty## as ##x\to\infty##. However, I'm wondering if I could use Mathematical Induction to prove this. Is the following correct and sufficiently rigorous (at least for an undergraduate-level Calculus...

Dear all,I have four questions. Hopefully, someone can answer. Thank you :) 1. A qubit is described as a two-orthogonal basis state. How about two entangled qubits? 2. What is the actual reason for a qubit cannot be cloned/copied? Is it because without knowing the value of the complex...

Hi! Suppose that someone had solved an old but open problem in the great area of mathematics and physics, for instance, dynamical systtems, algebraic geometry and differential equations. Based on your broad experience, what are the best scientific journals to submit such a discovery? In...

I'm a retired Engineer. I want to learn methods to formulate equations to ask questions of physics phenomenon. What school teaches this and by whom? Can anyone point me there?

I understand the mathematical difference, that the independent variables are the "reference position vector+time" for material description, and "current position vector+time" for the spatial description. But I can't seem to wrap my head around the concept of the spatial description.

I found a copy of David McMahon's "Quantum Field Theory Demystified" and I'm already confused on page 4 where he says, " . . in order to be truly compatible with special relativity, we need to discard the notion that \phi and \psi in the Klein-Gordon and Dirac equations respectively describe...

prove: The 2nd axiom of mathematical logic 2) $((P\implies(Q\implies R))\implies((P\implies Q)\implies(P\implies R))$ By using only the deduction theorem

Given the following axioms: 1) ##P\implies(Q\implies P)## 2) ##((P\implies(Q\implies R))\implies((P\implies Q)\implies(P\implies R))## Where ##P,Q,R## are any formulas 3)##(\neg P\implies\neg Q)\implies (Q\implies P)## then prove: ##\{A\implies B,B\implies C\}|- A\implies C## Without using the...

Hello : Have a question regarding the mathematical model of reflective curve where could i find information on it ? (pdf , webpages , ebooks ,...etc ) Other than Wikipedia Best Regards HB

In geometry, a vector ##\vec{X}## in n-dimensions is something like this $$ \vec{X} = \left( x_1, x_2, \cdots, x_n\right)$$ And it follows its own laws of arithmetic. In Linear Analysis, a polynomial ##p(x) = \sum_{I=1}^{n}a_n x^n ##, is a vector, along with all other mathematical objects of...

Ok, would i be correct to approach it this way, Let ##n=1##. If ##n=1##, then ##5^1+3## is divisible by ##4##, the statement is true for ##n=1##. Assume its true for ##n=k## ∀ ##kε\mathbb{z}^{+}.## Then ##5^k+3## is divisible by ##4.## i.e ##5^k+3=4m## ∀ ##m ε\mathbb{z}^{+}## Let ##n=k+1.##...

I finished my 1st-year physics, took analysis, linear algebra, mathematical logic, classical mechanics, quantum mechanics(I was exempted from intro phy and took some 3rd-year physics courses) I internal transferred to pure maths. The reason is that the curriculum of the physics programme in our...

What mathematical topics do I need to know to start studying general relativity? From which textbooks can I learn them? I don't currently know anything about differential geometry. I know calculus, linear algebra, mathematical methods of physics (the necessary topics for quantum mechanics) and...

Hi Fellas! My first post after a long hiatus from forums. Feeling nostalgia (this is the place where it all began, my fuel for quantum fascination so to speak). I am revisiting the mathematical formulation of quantum mechanics with the dimensional (MLT) perspective. I want to understand what...

[Moderator's note: Spin off from previous thread due to more advanced level of discussion.] The above is true even on an ordinary position-vs-time graph in PHY 101, when "distance" is appropriately defined. OOPS (Thanks @PeterDonis ) This turns out to be true only in the Galilean/Newtonian...

Assume we have a network consisting of a source with impedance ##Z_S## and load with impedance ##Z_L## and we want to perform impedance matching on them in order to obtain the maximum power transfer: Note that in practice there may occur sitations where causes more harm than profit (see eg...

I know for a wave moving from left to right, ##\psi_i = Ae^{i(\omega t - k_1x)}## The first reflection where ##Z_1## is ## R_{12}Ae^{i(\omega t - k_1x)}## The second reflection. The wave moves from 2 to the limit between 2 and 3 then reflect... Thus, ##T_{12}R_{23}T_{21} Ae^{i(\omega t - k_1 x...

Please could you help me find a rigorous mathematical definition of sampling as it is used in mathematical statistics? Let ##X:\Omega\rightarrow\mathbb{R}## be a random variable and ##X_{1},...,X_{n}## is a statistical sample. What is its mathematical meaning in probability theory? Are we...

Are there any QFT books that use little to no math? If there is a little math that is okay. I don't know much about math. I am looking for good explanations on how it works without math. Any help would be great!

Hi, Just curious as to whether distances 'd' , used in Knn ; K nearest neighbors, in Machine Learning, are required to be metrics in the Mathematical Sense, i.e., if they are required to satisfy, in a space A: ##d: A \times A \rightarrow \mathbb R^{+} \cup \{0\} ; d(a,a)=0 ; d(a,b)=d(b,a) ...

Hi guys, We have this very common graph where pV deviates from ideality. May I know the equation for such a curve? Secondly, if the x-axis were changed to V, what would the graph look like?

Physicist Max Tegmark proposed that every mathematically possible universe exists [1]. According to Tegmark himself, when he published such ideas, he received mostly positive feedback from Edward Witten and David Vogan [2]. Due to this, I was wondering whether Witten has made reference to...

Guys I have Problems with this task The arrangement consists of a point charge Q at a distance (x0, y0,0) from the origin and two perfectly conductive surfaces in the (x, z) and (y, z) plane a) Mathematical description of the space charge density p of the original and mirror charge using the...

A book on optics which is less mathematical maybe a similar one to physics for poets or gamow gravity classics

Hi PF In my textbook, the Spanish 6th edition of "Calculus", by Robert A. Adams, at Chapter 3.2, Theorem 1 states: If ##x>0##. $$\dfrac{d}{dx}\ln{x}=\dfrac{1}{x}$$ PROOF For ##x>0## and ##h>0##, ##\ln{(x+h)}-\ln{(x)}## is the area of the shaded part (...) Regard the shaded area at Figure...

I can choose any topic. The paper doesn't have to be original. Please suggest a simple paper to write which involves math and chemistry. I am in second year university.

How do various computer algebra systems (CAS) compare with respect to keeping multiple representations of the same mathematical object? For example, a polynomial could be represented by a list of coefficients, or a list of roots, or a list of factors with some factors non-linear. One design...

Hello, I have been thinking of it for a long time, and I would appreciate suggestions from math experts. I am working on a simulation of human agents. I want to set up a formula that defines the consumption probability (0,1), which consists of X, a value between 0 and 1, and two positive and...

I read this article History of James Clerk Maxwell and it talks about Maxwell and Dirac also at some point. It is said that Maxwell thought geometrically, and also Dirac said he thought of de Sitter Space geometrically. They say their approach to mathematics is geometric. I see this mentioned...

I am not sure this is the right section to ask this question, but here it goes. So, I was studying Stat. Physics and I came across this paper, A Mathematical Theory of Communication. What it's so important about this paper?

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I know Phi appears often when modelling exponential growth and, probably because of that, also in Biology/Ecology. But does it appear spontaneously in the mathematical description of some fundamental physics phenomenon at all? (As does Pi, the ubiquitous irrational number) Hope I'm posting on...

I was recently studying the pressure gradient force, and I found it interesting (though this may be incorrect) that you can use a Taylor expansion to pretend that the value of the internal pressure of the fluid does not matter at all, because the internal pressure forces that are a part of the...