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chizhek's user avatar
chizhek's user avatar
chizhek's user avatar
chizhek
  • Member for 10 years, 4 months
  • Last seen more than 3 years ago
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About

A retired mathematician, but still active (more than ever).
About the name and the icon: "chizhek" is Slovenian for "siskin".

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Top posts
question
8
Nonzero subdeterminants conjecture: has anybody seen this anywhere?
Jun 4, 2018
question
5
Attaching an ideal whose square is zero: does this operation have a name and a notation?
May 16, 2016
answer
5
Intuition for the last step in Serre's proof of the three-squares theorem
Sep 21, 2015
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21
Does a four-variable analog of the Hall-Witt identity exist?
10
Prove or disprove $2abc(a+b+c)\ge 3(a^2b^2c^2+1)$
8
How find this maximum and minimum of the value $\sum_{i=1}^{n-1}[x_{i+1}-x_{i}]$
7
How do I evaluate $\prod_{r=1}^{\infty }\left (1-\frac{1}{\sqrt {r+1}}\right)$?
6
Surfaces of revolution which are also ruled surfaces.