User Greg Muller

171 votes

7 answers

17k views

Does $\DeclareMathOperator\Aut{Aut}\Aut(\Aut(\dots\Aut(G)\dots))$ stabilize?

asked Nov 15, 2009 at 18:40

109 votes

11 answers

12k views

Why do Groups and Abelian Groups feel so different?

asked Oct 26, 2009 at 3:44

58 votes

7 answers

5k views

What are surprising examples of Model Categories?

asked Mar 16, 2010 at 4:36

35 votes

6 answers

4k views

Why Drinfel'd-Jimbo-type quantum groups?

asked Nov 14, 2009 at 17:46

32 votes

3 answers

5k views

Krull dimension less or equal than transcendence degree?

asked Nov 3, 2011 at 18:31

26 votes

1 answer

978 views

Idempotents in Rings of Differential Operators

asked Sep 8, 2010 at 13:46

24 votes

3 answers

3k views

The closure-complement-intersection problem

asked Apr 1, 2010 at 1:39

23 votes

2 answers

1k views

Finding citations for 'well-known' results

asked Apr 11, 2011 at 19:59

22 votes

2 answers

2k views

Are there moves between Reidemeister moves?

asked Nov 29, 2010 at 3:45

22 votes

5 answers

9k views

Maps to projective space determined by a line bundle

asked Nov 7, 2009 at 22:51

21 votes

8 answers

11k views

Beginning a sentence with a mathematical symbol

asked May 15, 2010 at 21:12

17 votes

3 answers

1k views

Freyd-Mitchell for triangulated categories?

asked Oct 20, 2009 at 15:34

17 votes

1 answer

983 views

What rings/groups have interesting quaternionic representations?

asked Mar 8, 2010 at 17:09

16 votes

1 answer

918 views

Coxeter Arrangements and an Identity

asked Nov 21, 2009 at 2:21

14 votes

5 answers

2k views

What is $\sum (x+\mathbb{Z})^{-2}$?

asked Jan 6, 2010 at 19:30

12 votes

1 answer

2k views

Can the Quantum Torus be realized as a Hall Algebra?

asked Feb 8, 2010 at 19:50

12 votes

1 answer

637 views

Does the image of a differential operator always contain an ideal?

asked Jun 14, 2010 at 4:34

11 votes

1 answer

827 views

Which cluster algebras are coordinate rings of double Bruhat cells?

asked Apr 26, 2011 at 20:25

11 votes

1 answer

1k views

How nice are representation varieties of Fuchsian groups?

asked May 28, 2011 at 17:40

11 votes

6 answers

805 views

Is the area of a polygonal linkage maximized by having all vertices on a circle?

asked Apr 27, 2010 at 19:36

11 votes

1 answer

471 views

When is the module of Kahler volume forms torsion-free?

asked Apr 16, 2013 at 18:05

10 votes

1 answer

779 views

Subcategories which still give a Yoneda embedding

asked Jan 6, 2012 at 17:19

10 votes

3 answers

848 views

Is the 'massive' Calogero-Moser system still integrable?

asked Feb 11, 2010 at 21:10

10 votes

1 answer

598 views

Are cluster variables prime elements?

asked Aug 16, 2011 at 19:06

9 votes

1 answer

262 views

Branch cuts of $GL_n^+(\mathbb{R})$

asked Jul 6, 2011 at 0:01

8 votes

2 answers

377 views

Relation between Lie Algebra Cohomology and Number of Relations of a Cyclic Module?

asked Nov 4, 2009 at 18:58

7 votes

1 answer

553 views

Depth Zero Ideals in the Homogenized Weyl Algebra

asked Dec 19, 2009 at 6:19

7 votes

0 answers

302 views

Directed arcs on a surface

asked Jun 24, 2011 at 20:39

7 votes

1 answer

480 views

Are Kahler differentials the same on the affine closure on a quasi-affine scheme?

asked Mar 4, 2011 at 22:36

7 votes

0 answers

208 views

What subspaces of n-tuples of rational functions can be the solution space to a system of differential equations?

asked Aug 23, 2010 at 18:55

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43 Questions

Does $\DeclareMathOperator\Aut{Aut}\Aut(\Aut(\dots\Aut(G)\dots))$ stabilize?

Why do Groups and Abelian Groups feel so different?

What are surprising examples of Model Categories?

Why Drinfel'd-Jimbo-type quantum groups?

Krull dimension less or equal than transcendence degree?

Idempotents in Rings of Differential Operators

The closure-complement-intersection problem

Finding citations for 'well-known' results

Are there moves between Reidemeister moves?

Maps to projective space determined by a line bundle

Beginning a sentence with a mathematical symbol

Freyd-Mitchell for triangulated categories?

What rings/groups have interesting quaternionic representations?

Coxeter Arrangements and an Identity

What is $\sum (x+\mathbb{Z})^{-2}$?

Can the Quantum Torus be realized as a Hall Algebra?

Does the image of a differential operator always contain an ideal?

Which cluster algebras are coordinate rings of double Bruhat cells?

How nice are representation varieties of Fuchsian groups?

Is the area of a polygonal linkage maximized by having all vertices on a circle?

When is the module of Kahler volume forms torsion-free?

Subcategories which still give a Yoneda embedding

Is the 'massive' Calogero-Moser system still integrable?

Are cluster variables prime elements?

Branch cuts of $GL_n^+(\mathbb{R})$

Relation between Lie Algebra Cohomology and Number of Relations of a Cyclic Module?

Depth Zero Ideals in the Homogenized Weyl Algebra

Directed arcs on a surface

Are Kahler differentials the same on the affine closure on a quasi-affine scheme?

What subspaces of n-tuples of rational functions can be the solution space to a system of differential equations?