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a9qd0wf

Moscow, Russia

I like crazy theories, even if they don't work. Mainly interested in connections between algebraic topology, group theory, geometric structures on spaces, various generating functions, serial murders and conspiracy theories.

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Top Questions
13 votes

Example of a ring with non-finitely generated unit group?

gr.group-theory ra.rings-and-algebras counterexamples asked Jul 5, 2018 at 20:08
mathoverflow.net

9 votes

(Torsion in) homology of free nilpotent groups

at.algebraic-topology gr.group-theory homological-algebra nilpotent-groups asked Dec 21, 2017 at 14:07
mathoverflow.net

9 votes

Derived functor of Malcev completion ( = "rational K-theory")

gr.group-theory homological-algebra algebraic-number-theory kt.k-theory-homology asked Dec 4, 2016 at 22:27
mathoverflow.net

9 votes

"Exactness" of operadic cohomology

homological-algebra operads asked Oct 31, 2018 at 11:17
mathoverflow.net

8 votes

n-Engel groups as "homotopy associative" groups

gr.group-theory asked Apr 5, 2017 at 20:50
mathoverflow.net

8 votes

Geometric meaning of Aomoto complex

at.algebraic-topology dg.differential-geometry complex-geometry asked Apr 20, 2017 at 16:44
mathoverflow.net

8 votes

Rational homotopy type of Hilbert scheme components

reference-request at.algebraic-topology rt.representation-theory rational-homotopy-theory asked May 23, 2017 at 21:04
mathoverflow.net

7 votes

Generalized Stallings theorem

gr.group-theory homological-algebra homological-dimension asked Apr 1, 2017 at 21:23
mathoverflow.net

7 votes

Lower central series of nearly metabelian groups

gr.group-theory asked Apr 30, 2018 at 16:23
mathoverflow.net

7 votes

Small modules over finite group with large cohomology

gr.group-theory finite-groups group-cohomology asked Jul 12, 2018 at 9:15
mathoverflow.net

1 2

Top Answers
36
Mistakes in Bredon's book "Topology and Geometry"?
mathoverflow.net

17
Is the decomposition of the homotopy type of a complex into a bouquet unique?
mathoverflow.net

15
Why is it that if a ring is simple, its center must be a field?
math.stackexchange.com

14
Which abelian groups are $\varprojlim^1$ groups?
mathoverflow.net

13
The map $k \mapsto \mathbf{PGL}_2(k)$
mathoverflow.net

12
Are the rationals definable in any number field?
mathoverflow.net

12
Hopf algebra with a non-invertible antipode
mathoverflow.net

11
What are the important open problems about Lie groups?
mathoverflow.net

10
Is there a compact complex manifold with $b_1(X)=b_2(X)=b_3(X)=b_4(X)=0$?
mathoverflow.net

9
Dimension of classifying space of a group
mathoverflow.net

9
Is there a $3$-commutative algebra?
mathoverflow.net

9
Reference for group cohomology
math.stackexchange.com

8
Deformation equivalent vs diffeomorphic to projective manifold
mathoverflow.net

8
Hochschild cohomology of group ring of a free group
mathoverflow.net

7
Are perfect complexes the same as compact objects in D(R) for noncommutative rings?
mathoverflow.net

6
Homomorphisms of $\mathbb{F}_2$ that preserve $aba^{-1}b^{-1}$
math.stackexchange.com

6
Classification of homology 5-spheres
math.stackexchange.com

6
G be a finite group and H be a non trivial proper subgroup of index 3, then G is not simple.
math.stackexchange.com

5
Different definitions of formality for groups
mathoverflow.net

5
A question about surjective maps between quadratic algebras
mathoverflow.net

5
Is it possible for a direct product to be isomorphic to the Zappa–Szép product?
mathoverflow.net

5
A group generated by $3$ elements such that the product of generators is in the centre
math.stackexchange.com

5
Key Results of Combinatorial Group Theory.
math.stackexchange.com