User Stefan Kohl

5 votes

Examples of eventual counterexamples

answered Apr 14 at 17:21

1 vote

Breakthroughs in mathematics in 2021

answered Dec 25, 2023 at 22:34

3 votes

Estimate for the order of the outer automorphism group of a finite simple group

answered May 20, 2023 at 11:41

3 votes

The half-life of a theorem, or Arnold's principle at work

answered Apr 9, 2023 at 9:38

2 votes

Orders of finite 2-simple groups

answered Feb 9, 2023 at 16:19

2 votes

Tweetable Mathematics

answered Apr 26, 2017 at 14:16

3 votes

Proving that a countable group is not finitely generated

answered Nov 19, 2022 at 16:48

6 votes

Group of exponential growth always contains a free sub-group?

answered May 1, 2022 at 12:18

0 votes

Modern results that are widely known, yet which at the time were ignored, not accepted or criticized

answered Feb 7, 2022 at 17:36

12 votes

Taking a theorem as a definition and proving the original definition as a theorem

answered Sep 27, 2021 at 12:45

1 vote

Accepted

Convergence on iterating a piecewise function

answered Aug 17, 2021 at 14:11

7 votes

Order of products of elements in symmetric groups

answered Apr 1, 2016 at 17:07

2 votes

3-term arithmetic progressions of terms as frequent as primes

answered Aug 2, 2021 at 9:20

37 votes

PhD dissertations that solve an established open problem

answered May 20, 2018 at 18:59

6 votes

Deciding if $\mathbb{Z}\ltimes_A \mathbb{Z}^5$ and $\mathbb{Z}\ltimes_B \mathbb{Z}^5$ are isomorphic or not

answered Aug 20, 2020 at 17:16

2 votes

Can finitely generated subgroups of limit groups be detected in free group quotients?

answered Jul 26, 2020 at 20:02

3 votes

Examples of eventual counterexamples

answered Mar 8, 2015 at 11:28

3 votes

Examples of eventual counterexamples

answered Mar 12, 2015 at 9:27

7 votes

Examples of eventual counterexamples

answered Aug 4, 2019 at 12:24

8 votes

Faithful projective representations of symmetric groups

answered Oct 29, 2015 at 14:27

5 votes

Bounds on number of conjugacy classes in terms of number of elements of a group ?

answered Dec 12, 2019 at 13:43

0 votes

Examples of eventual counterexamples

answered Jul 27, 2019 at 22:59

2 votes

What are the automorphism groups of direct products of dihedral group D4

answered Sep 15, 2018 at 15:08

116 votes

Examples of unexpected mathematical images

answered Aug 11, 2014 at 9:13

3 votes

Examples of unexpected mathematical images

answered Jul 27, 2017 at 19:43

6 votes

Database of integer edge lengths that can form tetrahedrons

answered Oct 1, 2017 at 16:47

14 votes

Accepted

Identify one group of linear transformations

answered May 1, 2017 at 9:41

6 votes

Classification of generously transitive groups

answered Mar 1, 2013 at 14:34

14 votes

Accepted

Lattice n-gons with ordered side lengths 1,2,3,...,n

answered Apr 30, 2016 at 13:53

32 votes

Accepted

Rational points on a sphere in $\mathbb{R}^d$

answered Mar 23, 2013 at 17:16

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149 Answers

Examples of eventual counterexamples

Breakthroughs in mathematics in 2021

Estimate for the order of the outer automorphism group of a finite simple group

The half-life of a theorem, or Arnold's principle at work

Orders of finite 2-simple groups

Tweetable Mathematics

Proving that a countable group is not finitely generated

Group of exponential growth always contains a free sub-group?

Modern results that are widely known, yet which at the time were ignored, not accepted or criticized

Taking a theorem as a definition and proving the original definition as a theorem

Convergence on iterating a piecewise function

Order of products of elements in symmetric groups

3-term arithmetic progressions of terms as frequent as primes

PhD dissertations that solve an established open problem

Deciding if $\mathbb{Z}\ltimes_A \mathbb{Z}^5$ and $\mathbb{Z}\ltimes_B \mathbb{Z}^5$ are isomorphic or not

Can finitely generated subgroups of limit groups be detected in free group quotients?

Examples of eventual counterexamples

Examples of eventual counterexamples

Examples of eventual counterexamples

Faithful projective representations of symmetric groups

Bounds on number of conjugacy classes in terms of number of elements of a group ?

Examples of eventual counterexamples

What are the automorphism groups of direct products of dihedral group D4

Examples of unexpected mathematical images

Examples of unexpected mathematical images

Database of integer edge lengths that can form tetrahedrons

Identify one group of linear transformations

Classification of generously transitive groups

Lattice n-gons with ordered side lengths 1,2,3,...,n

Rational points on a sphere in $\mathbb{R}^d$