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Mathematics : Recent Questions and Answers (Page 16)

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

Fast Numerical Approximation to system of non-linear equations

I am currently looking into Halley's Method. However, I wanted to see if there were better methods to solve the problem I am looking to solve. Fast means a low...

Asked on 12/29/2021

0 answer

dimension of a irreducible representation

Let G be a group and A an abelian subgroup of G. I want to prove that for each irreducible representation $p$ we have that $dim(p)leq [G:A]$.I...

Asked on 12/29/2021 by Myanklana

1 answer

What is the relationship between the Leibniz integral rule and the dominated convergence theorem?

The Leibniz integral rule states $${displaystyle {frac {d}{dx}}left(int _{a}^{b}f(x,t),dtright)=int _{a}^{b}{frac {partial }{partial x}}f(x,t),dt}$$ when the integral bounds are not a function of $x$, i.e. the variable...

Asked on 12/29/2021

3 answer

Equality in distribution based on particular equalities in expected values or in series of moments

Let $X$ and $Y$ be two random variables with values in $[0,1]$, such that $$E[X] = E[Y]$$ and $$ E[X+(1-X) ln(1-X)] = E[Y+(1-Y) ln(1-Y)] .$$...

Asked on 12/29/2021 by Adrien Deliège

1 answer

Determine a basis $B$ of $mathbb{R}^4$ and a basis $C$ of $mathbb{R}^5$

We have tha matrix begin{equation*}A:=begin{pmatrix}1 & 5 & 8 & 2 \ 2 & 4 & 6 & 0 \ 3 & 3 & 8 & 2 \...

Asked on 12/29/2021

1 answer

Prove that $f(x) leq K cdotexp(Lcdot int_a^x g(t)dt)$

Suppose that $f, g$ are non negative continuous functions in $[a, b]$, and $K, L$ positives constants such that$$f(x) leq K + L int_a^x...

Asked on 12/29/2021

2 answer

Use Cauchy formula to solve $int _0^{2pi} frac{dt}{acos t+ bsin t +c} $ given $sqrt{(a^2+b^2)}=1<c$

Use Cauchy formula to solve $$int _0^{2pi} frac{dt}{a cos t+ b sin t +c} $$ Given $sqrt{(a^2+b^2)}=1<c$.I tried a variable substitution, but nothing elegant. Can anyone solve...

Asked on 12/29/2021

3 answer

Finding $frac{cotgamma}{cot alpha+cotbeta}$, given $a^2+b^2=2019c^2$

This is a question that appeared in the $2018$ Southeast Asian Mathematical Olympiad:In a triangle with sides $a,b,c$ opposite angles $alpha,beta,gamma$, it is known that $$a^2+b^2=2019c^2$$...

Asked on 12/27/2021

3 answer

Number of irrational coordinates of the circle $x^2+y^2=5$.

It is given in the book by Malcolm Cameron, titled: Mathematics the Truth; that the circle $x^2+y^2=5$ has an infinite number of points with at least one coordinate irrational,...

Asked on 12/27/2021

1 answer

Splitting and adding the numbers

All the natural numbers from $1$ to $100$ are written adjacent to each other in a single row. Now, this is considered as a single number, $N$...

Asked on 12/27/2021 by Shane Watson

1 answer

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