User Andreas Thom

68 votes

4 answers

12k views

Nelson's program to show inconsistency of ZF

asked Aug 25, 2010 at 20:50

54 votes

2 answers

2k views

How many relations of length $n$ can exists in a group without enforcing shorter relations?

asked Feb 17, 2011 at 14:22

45 votes

8 answers

10k views

What is Realistic Mathematics?

asked Aug 7, 2010 at 16:07

44 votes

4 answers

5k views

Why is "P vs. NP" necessarily relevant?

asked Feb 3, 2011 at 21:04

39 votes

1 answer

2k views

Identities of commutators

asked Mar 11, 2016 at 10:07

33 votes

0 answers

1k views

Subalgebras of von Neumann algebras

asked Aug 5, 2010 at 21:40

30 votes

4 answers

4k views

Adjacency matrices of graphs

asked Jan 15, 2011 at 16:32

29 votes

1 answer

4k views

Furstenberg's Conjecture on 2-3-invariant continuous probability measures on the circle

asked Oct 30, 2010 at 10:32

29 votes

4 answers

2k views

Trees in groups of exponential growth

asked Mar 29, 2011 at 19:16

28 votes

0 answers

2k views

Finite-dimensional subalgebras of $C^\star$-algebras

asked Aug 11, 2010 at 9:49

26 votes

2 answers

4k views

Finite subgroups of unitary groups

asked Aug 5, 2010 at 13:24

26 votes

4 answers

789 views

Ring of closed manifolds modulo fiber bundles

asked Aug 25, 2010 at 21:40

24 votes

1 answer

1k views

Which natural numbers are a square minus a sum of two squares?

asked Dec 5, 2014 at 18:02

22 votes

1 answer

1k views

Word maps on compact Lie groups

asked Nov 9, 2010 at 20:22

22 votes

1 answer

1k views

Generation of finite index subgroups

asked Feb 9, 2011 at 19:59

21 votes

1 answer

781 views

Girth of the symmetric group

asked May 29, 2017 at 9:46

20 votes

1 answer

952 views

Amenable groups of deficiency $1$

asked Apr 10, 2012 at 16:16

18 votes

3 answers

6k views

The multiplicative order of 2 modulo primes

asked Apr 3, 2011 at 15:10

18 votes

1 answer

1k views

Analogue of Smith normal form for matrices over $\mathbb Z[t]$

asked Jan 13, 2011 at 10:56

18 votes

0 answers

827 views

Quotients of residually finite groups by amenable normal subgroups

asked Oct 4, 2010 at 6:19

17 votes

3 answers

974 views

A result of Schützenberger on commutators and powers in free groups

asked Dec 8, 2016 at 13:12

17 votes

2 answers

598 views

Infinite groups with oligomorphic conjugation action

asked Apr 6, 2017 at 15:01

15 votes

0 answers

189 views

Quantitative form of Wielandt's theorem

asked Feb 11, 2017 at 11:52

15 votes

2 answers

1k views

Is every finitely generated idempotent ring singly generated as a two-sided ideal?

asked Dec 1, 2011 at 11:05

15 votes

1 answer

1k views

Amenable groups with finite classifying space

asked Jan 30, 2011 at 16:54

15 votes

1 answer

686 views

Amenability of groups in terms of a perturbation condition

asked Jan 10, 2011 at 18:51

13 votes

1 answer

404 views

Self map of unitary group

asked Mar 2, 2011 at 7:15

13 votes

1 answer

592 views

Vanishing of higher homotopy groups of finite complexes

asked Oct 29, 2010 at 9:22

13 votes

3 answers

949 views

Polynomials vanishing modulo some integer $n$

asked Aug 3, 2015 at 16:36

12 votes

3 answers

2k views

Representability of matroids over $\mathbb R$

asked Dec 3, 2010 at 15:12

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63 Questions

Nelson's program to show inconsistency of ZF

How many relations of length $n$ can exists in a group without enforcing shorter relations?

What is Realistic Mathematics?

Why is "P vs. NP" necessarily relevant?

Identities of commutators

Subalgebras of von Neumann algebras

Adjacency matrices of graphs

Furstenberg's Conjecture on 2-3-invariant continuous probability measures on the circle

Trees in groups of exponential growth

Finite-dimensional subalgebras of $C^\star$-algebras

Finite subgroups of unitary groups

Ring of closed manifolds modulo fiber bundles

Which natural numbers are a square minus a sum of two squares?

Word maps on compact Lie groups

Generation of finite index subgroups

Girth of the symmetric group

Amenable groups of deficiency $1$

The multiplicative order of 2 modulo primes

Analogue of Smith normal form for matrices over $\mathbb Z[t]$

Quotients of residually finite groups by amenable normal subgroups

A result of Schützenberger on commutators and powers in free groups

Infinite groups with oligomorphic conjugation action

Quantitative form of Wielandt's theorem

Is every finitely generated idempotent ring singly generated as a two-sided ideal?

Amenable groups with finite classifying space

Amenability of groups in terms of a perturbation condition

Self map of unitary group

Vanishing of higher homotopy groups of finite complexes

Polynomials vanishing modulo some integer $n$

Representability of matroids over $\mathbb R$