Mathematics Definition and 995 Threads

My question; Which branch of maths is this? Also, can you give me a clue as to where to start regards solving this. Just a hint please, not a full explanation. I'm struggling to even guess at this one. I did think, '60 ponies, 5 of which are tagged, so, 5/60 tagged, which is 1/12 1/12 of the 60...

The rightmost position has 3 possibilities: ##x,y,z## The remaining two letters are to be arranged in 6 spaces: ##\frac{6!}{4!}## Now the 3 can be placed in ##\frac{4!}{3!}## Total no of ways =$$3×\frac{6!}{3!}=12×30$$ $$OR$$ Since ##x,y,z## are three different boxes/variables, we can use the...

I read from a text: "suppose a stock with price ##S## and variance ##v## satisfies the SDE $$dS_t = u_tS_tdt+\sqrt{v_t}S_tdZ_1$$$$dv_t = \alpha dt+\eta\beta\sqrt{v_t}dZ_2$$ with $$\langle dZ_1 dZ_2\rangle = \rho dt$$ where ##\mu_t## is the drift of stock price returns, ##\eta## the volatility of...

I thought this was too easy $$a+(b\times c)=0\implies a=-(b\times c)=(c\times b)$$ Then $$3(c.a)=3(c.(c\times b))=0$$ Since cross product of vectors is perpendicular to both vectors and dot product of perpendicular vectors is zero. Now here's the problem, correct answer given is 10. But how do...

DeepMind's new geometry problem-solver AlphaGeometry can solve Euclidean plane geometry questions from the International Mathematics Olympiad (IMO) almost as well as a human gold medallist. https://deepmind.google/discover/blog/alphageometry-an-olympiad-level-ai-system-for-geometry/...

I just came across this question and the ms indicates, Would ##31.5## be correct? ...i think it is rational as it can be expressed as ##31.5 = \dfrac{63}{2}##.

Heres how I proceeded, Equation of line ##AC## in vector form: $$\vec r=a+t(c-a)$$$$\vec r=(1i+4j+3k)+t(2i-6j+2k)$$ Since ##B## doesn't lie on ##AC## ##b\neq (1+2t)i +(4-6t)j+(3+2t)k## The following equation is derived: $$2\hat i+\alpha \hat j+4\hat k\neq (1+2t)\hat i +(4-6t)\hat j+(3+2t)\hat k...

Hello Everyone! I created a YouTube channel (here's the link) a few years ago in which I post detailed lectures in mathematics. I just started a series on General Topology. Following is a snapshot from a video. I mean to deliver a comprehensive course with a lot of pictures and intuition and...

Degree in chemistry and at one point was a physics and mathematics double major, but life intervened. Never got to finish but still read and work on novel amateur theory. At least, what I would call novel and amateur. My focus is on putting together theory on space-time and quantum field...

We have come to accept that Infinity times two is infinity. In the sense of 'size' we use to think about everyday numbers, the rules of arithmetic with infinities seem like nonsense. For example, consider the computable number $$0.100100100100100....$$ In the decimal expansion, there are...

https://www.uni-math.gwdg.de/aufzeichnungen/klein-scans/klein/ I hope you enjoy folks. It would be nice to see an English translation somewhere. Same for his encyclopedia.

Been dipping my toes into maths by examining how equations work on the most basic level, and I love encountering equations that turn out to model similar aspects in nature, for example the inverse square law is apparent in equations for gravity and for electromagnetism. In the thumbnail of...

I wanted to join this forum because of my interest in physics and the fact that I am learning it. I would say that I enjoy every area of physics, there is not one that does not interest me. In addition to physics, I am also interested in forensics, mathematics and a little bit of chemistry and...

do you know any books, videos, or notes that can help me to understand these topics: 1-primitive roots for primes 2-the existence of primitive roots I am using right now elementary number theory and its application by Kenneth H. Rosen to understand these topics, do you know another source that...

Hi. What exactly is happening mathematically when you integrate ##\frac{1}{x}## $$\int_a ^b \frac{1}{x} dx=\ln{b}-\ln{a}=\ln{\frac{b}{a}}$$ if there's units? Sure, they cancel if you write the result as ##\ln{\frac{b}{a}}##, but the intermediate step is not well-defined, so why should log rules...

I would appreciate if someone could help me to understand what is happening in section 12.3 from the Howard George's book. First of all, the propose of the section is to show how $SU(3)$ decomposes into $SU(2) \times U(1)$. But i can't understand what is happening. First of all, i can't get the...

I only have my AA so far (working towards physics degree), but I would like to start changing directions career-wise. I'm completely burnt out on my current field (went through several careers over the years, but lately, it's been sales, and I HATE sales, just good at it). I would love to do...

I have to prove ##a \cdot 1 = a = 1 \cdot a## for ##a \in \mathbb{N}##. The book I am using ("The real numbers and real analysis" by Ethan Bloch) defines Peano postulates little differently. Following is a set of Peano postulates I am using. (Axiom 1.2.1 in Bloch's book) There exists a set...

TL;DR Summary: Got my AA with a focus in physics nearly a decade ago. Looking to go back and finish what I started, but need to brush up and looking for good resources to do so? Looking for resources that are thorough that can help me brush up on calculus 1-3, physics 1-2, and possibly...

From the Introduction to https://arxiv.org/abs/2106.11285 "Since the dawn of time, human beings have asked some fundamental questions: who are we? why are we here? is there life after death? Unable to answer any of these, in this paper we will consider cohomology classes on a compact projective...

I want to calculate eccentric anomaly of all points of ellipse-circle intersection. Ellipse is not rotated and its center is in origin. Circle can be translated to (Cx, Cy) coordinates. I am using python for calculations. Only solution I found, is this...

In fact, it WAS a homework couple of years ago, and I've solved it, kind of (below). I still would like to find a cleaner solution. Here is what I did. Let's say, the apples are labeled, and their weights are ##x_1, x_2, ...##. He takes out the apple #1 and finds that, e.g., ##x_2+x_5+x_9+... =...

"Former math teacher explains why some students are good at math and others lag behind" The title of a news article shown on todays Yahoo site, https://www.yahoo.com/news/former-math-teacher-explains-why-122744193.html Looking in the section called " Why are some students ‘good’ at math and...

I know that we have to assume certain things for the math to be achievable (at my level). for instance, I assumed that the rocket goes in a straight line instead of orbiting around the earth at an angle. but I can't develop any further assumptions as the task is so generalised and open-ended...

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Firstly, the exercise itself is not difficult: On one hand, $$|(a + ib)(c + id)|^2 = |a + ib|^2|c + id|^2 = (a^2 + b^2) (c^2 + d^2) = MN.$$ On the other hand, ##(a + ib)(c + id) = p+ iq## for some integers p and q, and so $$|(a + ib)(c + id)|^2 = |p + iq|^2 = p^2 + q^2.$$ Thus, ##MN = p^2 +...

How did you find PF?: I was randomly searching the net for info on calculus books for self study, found a math reddit that brought me here. I'm 65. Not working since 2000. In HS, 9th Algebra 1 = A, 10th Geometry/Trig =A, 11th, Algebra 2= D, (long story)....so no Calculus in Sr yr. Through...

I want YouTube channels that systematically raise my mathematics and physics level

I understand the mathematics that 1 divided by infinity is virtually zero and so equals zero. I look on the internet and that is the answer that I get. Is this a simplification for early mathematics learning and, if I continue, will I find a more complex answer? The reason that I ask is that I...

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Going through this, am still checking but will post all the same; which method did they apply to find the roots of the attachment below. My thinking; Let ##p+qi## be the cube root of ##x^3-6x+2=0## then, ##\sqrt{x(x^2-6)}=i\sqrt{2}## ##(p^2-q^2+2pqi)(p+qi)= x^3-6x+2## We know that...

I am just starting on mathematics and physics so I might need your help. I look forward to learn from all of you.

Hi, PF There are two ways to write domain and range of a function: through set notation, or showing intervals. I've chosen the set notation, and, for ##y=\csc x##, this is the attempt: $$\text{D}:\{x\,|\,x\not\in{n\pi},\,n\not\in{\mathbb{Z}}\}$$ $$\text{R}:\{f(x)\,|\,x=\mathbb{R}\(-1,1)\}$$...

I realize of course that this will probably not apply to all physicists, but at least every physicist in my university's math department is very unrigorous when it comes to mathematics. This is frustrating because some of the physics material seems genuinely interesting, but the lack of an...

What is the difference between these to. -3² and (-3)² ? I know - x - = + I am told -3²= -9 not +9 -3² means -3 x -3 = 9 I am told (-3)² = 9

Here I want to address of the question if it is possible to make a sum over an uncontable set and discuss integration rules involving uncountably infinite constants. I will provide introduction in very condensed form to get quicker to the essense. Conservative part First of all, let us...

##\frac {1} {x^2 -c^2}## with ##c \neq {0}## So the first thing I do is split the ##x^2 -c^2## into the difference of squares so ##x +c## and ##x - c## I then do ##\frac {A} {x + c}## ##+## ##\frac {B} {x-c}##, and then let ##x=c## to zero out the expression. And that is where I am getting...

Hi everyone, I'm fibrebundle. I actually joined this forum because I'm really interested in abstract maths. I'm particularly intereseted in alegebraic topology and geometry at the moment. But I'm also really interested in spectral graph and graph theory. I'm starting grad school in engineering...

I'm in my last 2 years of high school, and I have to pick a speciality to study before becoming an undergraduate and studying in college. In the future, I'm hoping to become an experimental physicist. My high school offers 3 specialities that are relevant to physics to pick from, all of them...

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.

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I am a curious physics student who wants to learn how to use its knowledge to create things, to understand phenomenons and so on. I am looking for detailed explanations that use physics and maths. (books, websites, videos, etc.)

I remember there was a method of learning/teaching mathematics where all they do in class is to force students to prove the theorems themselves. What was this method again? It was named after someone.... @fresh_42 ?

IAM from Argentina. Aficionated physics and mathematics

Doing some self study here; my understanding of order of an element in a group is as follows: Order of ##3## in ##\mathbb{z_4}## can be arrived by having, ##3+3+3+3=12≡0## likewise, the order of ##12## in ##\mathbb{z_{20}}## can be arrived by ##12+12=24 ≡4≠0## ##12+12+12=36≡16≠0##...

Hello all, I've taken math through differential equations and linear algebra, am in my senior year of physics curricula while conducting McNair research regarding General Relativity. I found a NASA document outlining Einstein's field equations, which suggests only preparative familiarity with...

In short, I'm interested in working on a web-app to make landmark papers in theoretical physics and mathematics more broadly accessible, especially to undergraduate and graduate students who are looking to catch up to modern topics (without sacrificing rigor or exactness of understanding), and...

What is physical applied mathematics?

...Out of interest am trying to go through the attached notes, My interest is on the highlighted, i know that in ##\mathbb{z}/\mathbb{6z}## under multiplication we shall have: ##1*1=1## ##5*5=1## am assuming that how they have the ##(\mathbb{z}/\mathbb{6z})^{*}={1,5}## is that correct...

((x+1)^2 -1)/(x+1)^2 dx 1-1/(x+1)^2 dx Let u=x+1 1-1/u^2 du u+1/u +c (u^2+1)/u +c Not as answer given in the book.