Mathematics
Fedor Petrov's user avatar
Fedor Petrov's user avatar
Fedor Petrov's user avatar
Fedor Petrov
  • Member for 9 years, 2 months
  • Last seen more than a week ago
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17
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11
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17
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All Questions Answers
Score Newest
answer
24
Does $8a+5$ ever divide $b^2+8$?
Jun 10, 2016
answer
11
Can we partition the plane like this?
Mar 27, 2018
answer
7
Prove $ae^{\frac{x}{a}} + be^{-\frac{x}{b}}\leq e^{\frac{x^2}{8a^2b^2}}, \forall x \in \mathbb{R}$ if $a, b > 0; a + b = 1$
Oct 25, 2016
answer
6
By Wolfram $N(n,p)=\Big \lfloor \sqrt p\lfloor n(\sqrt p +p) \rfloor \Big\rfloor$ is even for $p=2$ with some values of $n$, it's always true?
May 18, 2021
answer
5
Trace of symmetric positive semidefinite matrix when diagonalized (as a bilinear form) in a non-orthogonal basis
Jul 29, 2014
answer
5
How to prove specific inequality, assuming $\prod\limits_{i=1}^{n}(a_{i}-1)=1$
Aug 21, 2017
answer
5
A series question
Jun 26, 2019
answer
5
Prove $\sum_{\gcd(p,1+i-i^2)=1} \frac{i}{1+i-i^2} = -5^{(p-3)/2} \bmod p$
Nov 1, 2019
answer
4
Need a *trivial* proof of an "obvious" combinatorial result
Apr 5, 2018
answer
4
Show that $\sum\limits_pa_p$ converges iff $\sum\limits_{n}\frac{a_n}{\log n}$ converges
Apr 29, 2022
Top network posts
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167
17 camels trick
69
integral of a "sin-omial" coefficients=binomial
59
Examples of notably long or difficult proofs that only improve upon existing results by a small amount
54
If any open set is a countable union of balls, does it imply separability?
51
The number $\pi$ and summation by $SL(2,\mathbb Z)$

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