User Benjamin Steinberg

84 votes

59 answers

11k views

Blackbox Theorems [closed]

asked Jun 13, 2012 at 20:58

41 votes

4 answers

2k views

What is the probability two random maps on n symbols commute?

asked Sep 24, 2013 at 14:26

38 votes

0 answers

1k views

Groups whose complex irreducible representations are finite dimensional

asked Sep 6, 2018 at 12:42

32 votes

3 answers

5k views

Why did Gabriel invent the term "quiver"?

asked Aug 14, 2011 at 17:13

29 votes

3 answers

4k views

Lawvere theories versus classical universal algebra

asked Jun 29, 2011 at 2:56

22 votes

4 answers

4k views

What is the main goal of a paper, really? [closed]

asked Dec 10, 2011 at 0:43

22 votes

2 answers

1k views

Toposes (topoi) as classifying toposes of groupoids

asked Dec 24, 2011 at 0:12

18 votes

2 answers

1k views

Is there a topos theoretic interpretation/proof of Quillen's Theorem A?

asked Jun 3, 2012 at 12:15

18 votes

1 answer

1k views

Can there exist a `natural' finitely generated group with an undecidable word problem?

asked Nov 17, 2011 at 23:51

16 votes

2 answers

1k views

Does the following condition imply the homotopy type of a wedge of spheres?

asked Dec 16, 2011 at 1:55

16 votes

2 answers

818 views

Decomposing $(\mathbb C^n)^{\otimes m}$ as a representation of $S_n\times S_m$

asked Mar 2, 2015 at 18:31

15 votes

2 answers

886 views

Is there a finitely generated residually finite group with solvable word problem that does not embed in a finitely presented residually finite group?

asked Jan 31, 2014 at 2:17

15 votes

1 answer

2k views

History of the notation $\mathbb Z_n$

asked Nov 25, 2011 at 19:35

15 votes

2 answers

970 views

Groups with a rational generating function for the word problem

asked Oct 21, 2011 at 15:38

15 votes

1 answer

605 views

Is choice needed to establish the existence of idempotent ultrafilters?

asked Apr 19, 2012 at 23:36

14 votes

1 answer

581 views

Group rings such that every (countably generated) module has a maximal submodule

asked Aug 18, 2018 at 14:53

12 votes

0 answers

397 views

What is an example of a word hyperbolic group without a finite complete rewriting system?

asked Jul 15, 2013 at 18:36

12 votes

3 answers

849 views

Applications of idempotent ultrafilters

asked Sep 17, 2012 at 15:16

12 votes

1 answer

744 views

Is the following construction of the 0-Hecke monoid (well) known?

asked Nov 21, 2011 at 18:59

12 votes

2 answers

1k views

The generalized word problem vs. the uniform generalized word problem

asked Aug 5, 2011 at 17:23

12 votes

0 answers

321 views

Combinatorial proof of invertibility of a symmetric matrix associated to the ring of matrices over a finite field

asked May 16, 2020 at 16:13

11 votes

8 answers

991 views

Interesting examples of generic behavior of mathematical objects being either unreasonably structured or simply unreasonable

asked May 7, 2014 at 14:49

10 votes

1 answer

274 views

A flatness result of Fiedorwicz for amalgamated free products of monoids in connection with classifying spaces of monoids

asked Apr 11, 2018 at 14:56

9 votes

3 answers

390 views

Is there a standard name for the following type of linear operator?

asked Feb 18, 2016 at 21:16

9 votes

1 answer

2k views

Terminology Concerning Oriented Simplicial Complexes

asked Jun 25, 2012 at 17:41

8 votes

1 answer

417 views

Cayley Graphs of Z/nZ with invertible adjacency matrices

asked Jun 6, 2012 at 15:09

8 votes

0 answers

386 views

Complexity of computing the minimum degree of a faithful linear representation of a finite group

asked Jan 18, 2012 at 4:54

8 votes

2 answers

427 views

Is there a general result that theorems about finite structures proved in ZFC can be proved in ZF?

asked Apr 6, 2012 at 13:53

8 votes

1 answer

800 views

How to recognize a finite dimensional algebra is Koszul or quadratic?

asked Jul 14, 2011 at 13:21

8 votes

1 answer

660 views

Growth of groups versus Schreier graphs

asked Nov 19, 2011 at 6:32

Stack Exchange Network

78 Questions

Blackbox Theorems [closed]

What is the probability two random maps on n symbols commute?

Groups whose complex irreducible representations are finite dimensional

Why did Gabriel invent the term "quiver"?

Lawvere theories versus classical universal algebra

What is the main goal of a paper, really? [closed]

Toposes (topoi) as classifying toposes of groupoids

Is there a topos theoretic interpretation/proof of Quillen's Theorem A?

Can there exist a `natural' finitely generated group with an undecidable word problem?

Does the following condition imply the homotopy type of a wedge of spheres?

Decomposing $(\mathbb C^n)^{\otimes m}$ as a representation of $S_n\times S_m$

Is there a finitely generated residually finite group with solvable word problem that does not embed in a finitely presented residually finite group?

History of the notation $\mathbb Z_n$

Groups with a rational generating function for the word problem

Is choice needed to establish the existence of idempotent ultrafilters?

Group rings such that every (countably generated) module has a maximal submodule

What is an example of a word hyperbolic group without a finite complete rewriting system?

Applications of idempotent ultrafilters

Is the following construction of the 0-Hecke monoid (well) known?

The generalized word problem vs. the uniform generalized word problem

Combinatorial proof of invertibility of a symmetric matrix associated to the ring of matrices over a finite field

Interesting examples of generic behavior of mathematical objects being either unreasonably structured or simply unreasonable

A flatness result of Fiedorwicz for amalgamated free products of monoids in connection with classifying spaces of monoids

Is there a standard name for the following type of linear operator?

Terminology Concerning Oriented Simplicial Complexes

Cayley Graphs of Z/nZ with invertible adjacency matrices

Complexity of computing the minimum degree of a faithful linear representation of a finite group

Is there a general result that theorems about finite structures proved in ZFC can be proved in ZF?

How to recognize a finite dimensional algebra is Koszul or quadratic?

Growth of groups versus Schreier graphs