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Mathematics : Recent Questions and Answers (Page 19)

Find answers to your questions about Mathematics or help others by answering their Mathematics questions.

Unique solution to an Initial Value Problem

I'm trying to find if the solution of the following initial value problem is unique.begin{align}y' &= 3 (y^{2/3})\y(0) &= 0end{align}I have tried with...

Asked on 12/27/2021

2 answer

Why not generalize the concept of prime numbers?

A prime number is a natural number N > 1, that is divisible only by 1 and N (N/1).The number 1 is given special treatment in this definition, and...

Asked on 12/27/2021

1 answer

Topologically Transitive Flow on $R^n$

I have been looking but cannot find the following: an example of a topologically transitive map on $mathbb{S}^n$ or on $mathbb{R}^n$ (for arbitrary $n$). Here, by...

Asked on 12/27/2021

1 answer

Solving the system $cos x+cos y+cos z=frac32sqrt3$, $sin x+sin y+sin z=frac32$

Suppose we have$$begin{align}cos x + cos y + cos z &= frac{3}{2}sqrt{3} \[4pt]sin x + sin y + sin z &= frac{3}{2}end{align}$$ How...

Asked on 12/25/2021 by mbalasundar

2 answer

Distribution of an angle between 3 normally distributed 2D points

Example image Given 3 normally distributed points in 2D space, what would the distribution of the angle $alpha$ between the three points be & can it...

Asked on 12/25/2021 by simejanko

1 answer

Relation between number of edges and the sum of number of vertices of degree k

Let P be a polyhedron and let G be its associated graph. Suppose P has Vvertices, E edges, and F faces. For each k, let $V_k$ be the...

Asked on 12/25/2021 by Dang Dang

1 answer

About basis of vector space of polynomial degree less than n

Let $r in mathbb{R}$ be an arbitrary real number. Show that $beta=left{1, x-r,(x-r)^{2},(x-r)^{3}, ldots,(x-r)^{n}right}$ is a basis of $P_{n}(mathbb{R})$. I know that if I can show this...

Asked on 12/25/2021

2 answer

Dependent Simultaneous Equations

My maths TB says: For the simultaneous equations, $a_1x + b_1y + c_1 = 0$ and $a_2x + b_2y + c_2 = 0$ if $dfrac{a_1}{a_2} = dfrac{b_1}{b_2}...

Asked on 12/25/2021

2 answer

What is the pdf of $frac{|x-y|}{(x+y)(2-x-y)}$ when $x,y$ are i.i.d uniform on $[0,1]$?

If $x,y$ are i.i.d uniform random variables on $[0,1]$. I know that the PDF of $|x-y|$ is: $$f(z) = begin{cases}2(1-z) & text{for $0 < z...

Asked on 12/25/2021

2 answer

Example of Separable Product Space with cardinality greater than continuum?

In Willard, it's given that, for Hausdorff non-singleton spaces -$prod_{alphain A}X_alpha$ is separable iff $X_alpha$ is separable $forallalphain A$ and $|A|lemathfrak{c}$From reading the proof, I found...

Asked on 12/25/2021

2 answer

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