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Denis T's user avatar
Denis T's user avatar
Denis T
  • Member for 8 years, 6 months
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  • Moscow, Russia
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About

looking at groups and spaces
trying to feel what is metric
and what it isn't
and what it should be

mostly doing math via sotto voce exegesis (i. e. not really doing anything)
also i like filtrations and localisations

email denis.thn[]gmail.com

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Top posts
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35
Mistakes in Bredon's book "Topology and Geometry"?
Jan 24, 2019
answer
17
Is the decomposition of the homotopy type of a complex into a bouquet unique?
Apr 11, 2022
answer
14
Which abelian groups are $\varprojlim^1$ groups?
Oct 9, 2020
question
13
Example of a ring with non-finitely generated unit group?
Jul 5, 2018
answer
13
The map $k \mapsto \mathbf{PGL}_2(k)$
Oct 11, 2022
answer
12
Hopf algebra with a non-invertible antipode
Mar 6, 2022
answer
12
Are the rationals definable in any number field?
Mar 28, 2018
answer
11
What are the important open problems about Lie groups?
Aug 24, 2023
answer
10
Is there a compact complex manifold with $b_1(X)=b_2(X)=b_3(X)=b_4(X)=0$?
Dec 31, 2021
question
9
Derived functor of Malcev completion ( = "rational K-theory")
Dec 4, 2016
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15
Why is it that if a ring is simple, its center must be a field?
11
Reference for group cohomology
6
Homomorphisms of $\mathbb{F}_2$ that preserve $aba^{-1}b^{-1}$
6
Classification of homology 5-spheres
6
G be a finite group and H be a non trivial proper subgroup of index 3, then G is not simple.