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Mathematics : Recent Questions and Answers (Page 124)

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

Prove that $19| 2^{2^{6k+2}}+3$ for k = 0,1,2,3....

Quite new at Number Theory, all I tried so far is converting this into a congruence but I am not sure what to do after that....

Asked on 02/09/2021 by Shlok Jain

5 answer

Help with a prime number spiral which turns 90 degrees at each prime

I awoke with the following puzzle that I would like to investigate, but the answer may require some programming (it may not either). I have asked on the meta...

Asked on 02/09/2021

13 answer

How to seat $n$ people in $n$ seats if each person must take a seat next to an already sitting person?

The question is exactly the same as in Permutations - n people and n seats Copied here for your reference: Imagine we have a room containing $n$ seats...

Asked on 02/09/2021

3 answer

Big Omega and Big Omega Infinity Differences

In a book it is written that by writing f(n)=omega_infinity(g(n)) we mean that there exists a positive constant c such that f(n)>=cg(n)>=0 for infinitely many integers n. Whereas a Big...

Asked on 02/09/2021 by tyMind

1 answer

Evaluating real integral using complex analysis.

I'm trying to compute the following integral:$$int_0^{infty}frac{sqrt{x}}{1+x^4}dx$$ I'll not write down everything I've done, but choosing the branch cut on the positive real axes we have that: ...

Asked on 02/09/2021 by DoctorK_

3 answer

I am having difficulty understanding this differentiation question

SO I have this question: I think the question is asking me to do a a partial differentiation to find dx/ds, dy/ds,...

Asked on 02/09/2021

1 answer

PDF of sufficient statistic of a normal distribution $N(0, theta)$

Given: $x_1, x_2....x_n$ is a random sample and an iid with normal distribution $N(0,theta)$ where variance is the unknown paramter. I calculated the sufficient statistic for this case...

Asked on 02/09/2021 by tanay mukherjee

1 answer

Do you know this finitely presented group on two generators?

I computed using Sage the fundamental group of some topological space and got the infinite group$$langle a, bmid aba^{-1}barangle.$$By the change of variables $x=b^{-1}$ and ...

Asked on 02/09/2021

1 answer

Is this a correct way to show that $sum_{k=2}^{infty} frac {1}{sqrt k+k(-1)^k}$ converges?

Show that $sum_{k=2}^{infty} frac {1}{sqrt k+k(-1)^k}$ converges or diverges. My attempt is ot first rewrite and see if the sequence is convergent according to the Leibniz test: $frac...

Asked on 02/09/2021 by Labbsserts

1 answer

Abelian subgroup of prime power index

I am having difficulty with the following problem. Show that, a finite non-abelian simple group cannot have an abelian subgroup of prime power index. What I was thinking is that...

Asked on 02/09/2021 by Devendra Singh Rana

1 answer

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