Mathematics
Ivan Neretin's user avatar
Ivan Neretin's user avatar
Ivan Neretin's user avatar
Ivan Neretin
  • Member for 8 years
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  • Moscow, Russia
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PhD in physical chemistry.

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All Questions Answers
Score Newest
answer
26
$a_n$ is the smallest positive integer number such that $\sqrt{a_n+\sqrt{a_{n-1}+...+\sqrt{a_1}}}$ is positive integer
Oct 12, 2017
answer
25
Let $p_1, p_2,\dots,p_n$ be polynomials of $k$ variables $x_1,\dots,x_k$ and $p_1^2 + \dots +p_n^2=x_1^2 + \dots + x_k^2$ Prove that $n \geq k$.
Dec 16, 2015
answer
20
Choose $3n$ points on a circle, show that there are two diametrically opposite point
Nov 5, 2015
answer
18
How to calculate $\int_{0}^{\infty}\frac{x^{2}\ln x}{(1+x^{3})^4}dx$
Apr 14
answer
18
Identify $C\approx1.29$ the limit of $\left(\pi - 2^n \sqrt{2-\sqrt{2+\cdots+\sqrt 2}}\right)\cdot 4^n$
Aug 8, 2016
answer
12
solve this diophantine equation: ${\rm lcm}[x,y]+{\rm lcm}[y,z]+{\rm lcm}[z,x]=3(x+y+z)$
Mar 15, 2017
answer
11
Show that there are no integers $x, y$ such that $x^{2015} - y^{2016} = 2115$
Sep 13, 2015
answer
11
Find all the prime factors of $1000027$
Dec 28, 2016
answer
11
$\frac{2}{3} \cdot \frac{5}{6} \cdot \frac{8}{9} \cdot ... \cdot \frac{995}{996} \cdot \frac{998}{999}$ and $0.1$ which is bigger?
Feb 4, 2021
answer
10
In the history of mathematics, has there ever been a mistake?
Oct 4, 2015
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Why is absolute zero unattainable?
51
Has a carbon compound ever been found having an ionic bond?
47
What does the circle inscribed in a benzene ring represent?
43
Is there radioactivity at absolute zero?
40
Does the mass of sulfur really decrease when dissolved in water and increase when burnt?

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