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Mathematics
Alex Ravsky's user avatar
Alex Ravsky's user avatar
Alex Ravsky's user avatar
Alex Ravsky
  • Member for 11 years, 3 months
  • Last seen this week
  • Lviv, Ukraine
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My CV: a mathematician. My papers: arXiv, Google Scholar.

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Top posts
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104
How to prove every closed interval in R is compact?
Apr 21, 2013
28
Graph theoretic proof: For six irrational numbers, there are three among them such that the sum of any two of them is irrational.
Jul 30, 2016
25
Graph theoretic proof: For six irrational numbers, there are three among them such that the sum of any two of them is irrational.
Jul 30, 2016
22
Do Hausdorff spaces that aren't completely regular appear in practice?
Feb 19, 2019
21
Integer function which takes every value infinitely often
Oct 30, 2016
17
Is a finite group determined by the family of all its 2-generated subgroups?
Jul 16, 2013
17
Hard problems solving tricks
Jan 26, 2021
16
A chess knight's moves
Oct 25, 2016
15
Asymptotics of the sum of squares of binomial coefficients
Apr 24, 2013
14
How to show $\{\{x\}\} \neq x$?
Apr 19, 2013
Top Meta posts
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12
Bounties don't last long enough
4
Etiquette of letting a bounty expire on a question with an upvoted but incomplete answer?
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11
Non meager rectangle
10
Dividing a cake between $n-1$, $n$, or $n+1$ guests
10
Desargues ten point configuration $D_{10}$ in LaTeX
10
A rainbow perfect matching in an edge-colored graph with spanning color classes
8
Are topological PID's Noetherian?