User Andreas Thom

4 votes

The difference between $l^1(G)$ and the reduced group $C^$ algebra $C_r^(G)$

answered Aug 8, 2010 at 9:22

4 votes

Hochschild/cyclic homology of von Neumann algebras: useless?

answered Aug 8, 2010 at 10:53

4 votes

Looking for references talking about category of topological vector spaces

answered Aug 8, 2010 at 11:23

4 votes

Accepted

Completely equivalent operator norms on $*$-Banach algebras.

answered Aug 10, 2010 at 15:28

4 votes

Ultraproducts of finite cyclic groups

answered Aug 31, 2010 at 10:49

3 votes

Commutation of $GL_{n}$ with projective limits

answered Oct 31, 2010 at 9:24

3 votes

Accepted

Continuity of functors under inductive sequence of $C^*$-algebras.

answered Oct 10, 2010 at 18:00

3 votes

balls as Foelner sets

answered Oct 28, 2010 at 15:57

3 votes

Continuous sections of the morphism ${GL}_{n}(A) \to {GL}_{n}(A/I)$, where A is a topological ring and I denotes a nilpotent ideal.

answered Oct 22, 2010 at 12:47

3 votes

Is there a characterization of free groups in terms of the unitary dual?

answered Oct 24, 2010 at 10:24

3 votes

Accepted

Derivation of von Neumann algebra which is zero on MASA

answered Jan 13, 2011 at 14:05

3 votes

Accepted

Is every bounded representation of Z unitarisable when all sets are measurable?

answered Feb 4, 2011 at 8:01

3 votes

Accepted

Is there an abstract characterization of freeness in terms of additive unitary cocycles?

answered Nov 29, 2010 at 14:57

3 votes

Do subalgebras of C(X) admit a description in terms of the compact Hausdorff space X?

answered Dec 5, 2011 at 17:11

3 votes

Is the poset of all precompact group topologies on an abelian group $G$, order-isomorphic to $\operatorname{Sub}(\hat{G})$?

answered Feb 15, 2015 at 19:49

3 votes

Accepted

A small rank linear combination of a small number of elements of a group

answered Dec 30, 2014 at 16:10

3 votes

Small values of a polynomial evaluated at roots of unity

answered Aug 20, 2014 at 21:14

3 votes

Map from algebraic K-theory to topological K-theory

answered Mar 18, 2015 at 9:04

3 votes

About some positive elements in a group von Neumann algebra

answered Jun 26, 2018 at 12:14

2 votes

Tournament contained in vertex transitive tournament

answered Apr 30, 2019 at 6:50

2 votes

Closed free subgroups of the automorphism group of the countable atomless boolean algebra

answered Jun 1, 2018 at 8:24

2 votes

Finding an "optimal" quotient in a free group

answered Apr 1, 2016 at 12:33

2 votes

Is there an effective way to calculate K-theory using Morse functions?

answered Aug 12, 2014 at 16:04

2 votes

Fast construction of straight line programs?

answered May 16, 2014 at 15:48

2 votes

Bound on the index of an abelian subgroup in discrete subgroup of the euclidean group?

answered Jul 21, 2014 at 9:58

2 votes

Accepted

Which polynomials are Fricke polynomials ?

answered Jul 24, 2012 at 19:31

2 votes

vector balancing problem

answered May 23, 2012 at 8:06

2 votes

How similar/different are dense subgroups of a compact group.

answered Jan 28, 2013 at 10:44

2 votes

Return probabilities for random walks on infinite Schreier graphs

answered Mar 27, 2012 at 15:19

2 votes

Accepted

Amenability with respect to a function

answered Sep 11, 2011 at 0:52

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167 Answers

The difference between $l^1(G)$ and the reduced group $C^$ algebra $C_r^(G)$

Hochschild/cyclic homology of von Neumann algebras: useless?

Looking for references talking about category of topological vector spaces

Completely equivalent operator norms on $*$-Banach algebras.

Ultraproducts of finite cyclic groups

Commutation of $GL_{n}$ with projective limits

Continuity of functors under inductive sequence of $C^*$-algebras.

balls as Foelner sets

Continuous sections of the morphism ${GL}_{n}(A) \to {GL}_{n}(A/I)$, where A is a topological ring and I denotes a nilpotent ideal.

Is there a characterization of free groups in terms of the unitary dual?

Derivation of von Neumann algebra which is zero on MASA

Is every bounded representation of Z unitarisable when all sets are measurable?

Is there an abstract characterization of freeness in terms of additive unitary cocycles?

Do subalgebras of C(X) admit a description in terms of the compact Hausdorff space X?

Is the poset of all precompact group topologies on an abelian group $G$, order-isomorphic to $\operatorname{Sub}(\hat{G})$?

A small rank linear combination of a small number of elements of a group

Small values of a polynomial evaluated at roots of unity

Map from algebraic K-theory to topological K-theory

About some positive elements in a group von Neumann algebra

Tournament contained in vertex transitive tournament

Closed free subgroups of the automorphism group of the countable atomless boolean algebra

Finding an "optimal" quotient in a free group

Is there an effective way to calculate K-theory using Morse functions?

Fast construction of straight line programs?

Bound on the index of an abelian subgroup in discrete subgroup of the euclidean group?

Which polynomials are Fricke polynomials ?

vector balancing problem

How similar/different are dense subgroups of a compact group.

Return probabilities for random walks on infinite Schreier graphs

Amenability with respect to a function