User Keivan Karai

36 votes

Jokes in the sense of Littlewood: examples?

answered Sep 16, 2010 at 12:04

28 votes

Wonderful applications of the Vandermonde determinant

answered Oct 25, 2010 at 17:27

27 votes

Accepted

prime ideals in C([0,1])

answered Aug 17, 2010 at 3:42

27 votes

Accepted

Ultraproducts of finite cyclic groups

answered Aug 31, 2010 at 10:47

26 votes

Why are free groups residually finite?

answered Apr 6, 2010 at 10:24

24 votes

Accepted

Zariski-closed subsemigroups of SL_n(C) are groups

answered Nov 22, 2010 at 12:50

16 votes

A question about "Zariski dense" arguments

answered Aug 23, 2014 at 15:18

13 votes

German mathematical terms like "Nullstellensatz"

answered Apr 19, 2011 at 17:57

13 votes

Partition of R into midpoint convex sets

answered Apr 23, 2010 at 12:41

11 votes

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

answered Aug 8, 2010 at 1:15

10 votes

What is your favorite "strange" function?

answered Apr 23, 2010 at 12:32

10 votes

Accepted

Amenable exponential growth

answered Feb 20, 2011 at 19:17

10 votes

Accepted

discrete subgroups in p-adic Lie groups?

answered Oct 18, 2010 at 10:33

10 votes

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

answered Mar 22, 2011 at 13:40

9 votes

Uniform lattices in semisimple Lie groups

answered Aug 23, 2011 at 2:58

7 votes

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

answered Mar 3, 2011 at 11:23

6 votes

Origins of Mathematical Symbols/Names

answered Apr 15, 2010 at 8:53

6 votes

Function with range equal to whole reals on every open set

answered Jul 16, 2010 at 12:22

4 votes

Dense cyclic subgroup

answered Aug 31, 2010 at 10:29

4 votes

Accepted

description of functions of conditionally negative type on a group

answered Sep 2, 2010 at 9:54

4 votes

When does the set of isometries form a group?

answered Sep 17, 2011 at 16:35

3 votes

Undergraduate Probability Topics

answered Sep 2, 2010 at 9:41

3 votes

Random Walk anecdote.

answered Apr 21, 2010 at 9:43

3 votes

Are extensions of linear groups linear?

answered Apr 28, 2010 at 8:49

2 votes

How Can I Tell when A Subgroup of a Lie Group is Generated by Unipotents?

answered Apr 26, 2010 at 7:38

2 votes

Uniqueness in Composition of Polynomials

answered Mar 25, 2010 at 14:06

2 votes

Importance of Poincaré recurrence theorem? Any example?

answered Sep 17, 2011 at 3:59

2 votes

A large deviation / binomial coefficients bound

answered Apr 21, 2011 at 10:02

2 votes

arithmetic groups VS. Zariski dense discrete subgroups?

answered Nov 17, 2010 at 15:11

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

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38 Answers

Jokes in the sense of Littlewood: examples?

Wonderful applications of the Vandermonde determinant

prime ideals in C([0,1])

Ultraproducts of finite cyclic groups

Why are free groups residually finite?

Zariski-closed subsemigroups of SL_n(C) are groups

A question about "Zariski dense" arguments

German mathematical terms like "Nullstellensatz"

Partition of R into midpoint convex sets

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

What is your favorite "strange" function?

Amenable exponential growth

discrete subgroups in p-adic Lie groups?

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

Uniform lattices in semisimple Lie groups

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

Origins of Mathematical Symbols/Names

Function with range equal to whole reals on every open set

Dense cyclic subgroup

description of functions of conditionally negative type on a group

When does the set of isometries form a group?

Undergraduate Probability Topics

Random Walk anecdote.

Are extensions of linear groups linear?

How Can I Tell when A Subgroup of a Lie Group is Generated by Unipotents?

Uniqueness in Composition of Polynomials

Importance of Poincaré recurrence theorem? Any example?

A large deviation / binomial coefficients bound

arithmetic groups VS. Zariski dense discrete subgroups?

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