User Keivan Karai

2 votes

Problems where we can't make a canonical choice, solved by looking at all choices at once

answered Dec 21, 2010 at 11:23

2 votes

Importance of Poincaré recurrence theorem? Any example?

answered Sep 17, 2011 at 3:59

2 votes

Inequality for trace of a symmetric product?

answered Jun 24, 2020 at 6:40

28 votes

Wonderful applications of the Vandermonde determinant

answered Oct 25, 2010 at 17:27

16 votes

A question about "Zariski dense" arguments

answered Aug 23, 2014 at 15:18

0 votes

Examples of finite dimensional non simple non abelian Lie algebras

answered Oct 14, 2011 at 16:49

4 votes

When does the set of isometries form a group?

answered Sep 17, 2011 at 16:35

9 votes

Uniform lattices in semisimple Lie groups

answered Aug 23, 2011 at 2:58

2 votes

A large deviation / binomial coefficients bound

answered Apr 21, 2011 at 10:02

13 votes

German mathematical terms like "Nullstellensatz"

answered Apr 19, 2011 at 17:57

10 votes

A set for which it is hard to determine whether or not it is countable.

answered Mar 22, 2011 at 13:40

7 votes

Automorphisms of $SL_n(\mathbb{Z})$

answered Mar 3, 2011 at 11:23

10 votes

Accepted

Amenable exponential growth

answered Feb 20, 2011 at 19:17

0 votes

When is the group of homeomorphisms of a compact space locally compact?

answered Dec 1, 2010 at 20:03

24 votes

Accepted

Zariski-closed subsemigroups of SL_n(C) are groups

answered Nov 22, 2010 at 12:50

2 votes

arithmetic groups VS. Zariski dense discrete subgroups?

answered Nov 17, 2010 at 15:11

0 votes

Variants of point fixed theorem

answered Oct 26, 2010 at 15:16

0 votes

Symmetric subspace of linear operators

answered Oct 25, 2010 at 8:49

10 votes

Accepted

discrete subgroups in p-adic Lie groups?

answered Oct 18, 2010 at 10:33

36 votes

Jokes in the sense of Littlewood: examples?

answered Sep 16, 2010 at 12:04

4 votes

Accepted

description of functions of conditionally negative type on a group

answered Sep 2, 2010 at 9:54

3 votes

Undergraduate Probability Topics

answered Sep 2, 2010 at 9:41

27 votes

Accepted

Ultraproducts of finite cyclic groups

answered Aug 31, 2010 at 10:47

4 votes

Dense cyclic subgroup

answered Aug 31, 2010 at 10:29

27 votes

Accepted

prime ideals in C([0,1])

answered Aug 17, 2010 at 3:42

11 votes

Any factor group of a finite abelian group is isomorphic to some subgroup

answered Aug 8, 2010 at 1:15

1 vote

Are there locally compact groups which have no compact open subgroups and no discrete infinite cyclic subgroups?

answered Aug 2, 2010 at 10:49

6 votes

Function with range equal to whole reals on every open set

answered Jul 16, 2010 at 12:22

-2 votes

Subspaces of finite codimension in Banach spaces

answered Jul 7, 2010 at 11:05

0 votes

What are the normal subgroups of a direct product?

answered May 6, 2010 at 12:38

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38 Answers

Problems where we can't make a canonical choice, solved by looking at all choices at once

Importance of Poincaré recurrence theorem? Any example?

Inequality for trace of a symmetric product?

Wonderful applications of the Vandermonde determinant

A question about "Zariski dense" arguments

Examples of finite dimensional non simple non abelian Lie algebras

When does the set of isometries form a group?

Uniform lattices in semisimple Lie groups

A large deviation / binomial coefficients bound

German mathematical terms like "Nullstellensatz"

A set for which it is hard to determine whether or not it is countable.

Automorphisms of $SL_n(\mathbb{Z})$

Amenable exponential growth

When is the group of homeomorphisms of a compact space locally compact?

Zariski-closed subsemigroups of SL_n(C) are groups

arithmetic groups VS. Zariski dense discrete subgroups?

Variants of point fixed theorem

Symmetric subspace of linear operators

discrete subgroups in p-adic Lie groups?

Jokes in the sense of Littlewood: examples?

description of functions of conditionally negative type on a group

Undergraduate Probability Topics

Ultraproducts of finite cyclic groups

Dense cyclic subgroup

prime ideals in C([0,1])

Any factor group of a finite abelian group is isomorphic to some subgroup

Are there locally compact groups which have no compact open subgroups and no discrete infinite cyclic subgroups?

Function with range equal to whole reals on every open set

Subspaces of finite codimension in Banach spaces

What are the normal subgroups of a direct product?