User DavidLHarden

30 votes

0 answers

942 views

Is there a Mathieu groupoid M_31?

asked Jul 18, 2011 at 21:48

12 votes

1 answer

419 views

Maximal Sylow 2-subgroups of simple groups

asked Jun 16, 2017 at 8:06

11 votes

4 answers

1k views

Efficient presentations for finite groups

asked Mar 29, 2011 at 4:05

11 votes

3 answers

902 views

(A very limited instance of) Lagrange's Theorem's converse and A_5

asked Apr 16, 2011 at 3:58

10 votes

2 answers

3k views

Orders of automorphism groups of p-groups

asked Jun 17, 2011 at 23:15

10 votes

2 answers

3k views

Larger cycle than 4, 2, 1 in Collatz iteration?

asked Jun 24, 2011 at 17:02

10 votes

1 answer

634 views

All maximal subgroups have odd index

asked Sep 30, 2016 at 9:27

9 votes

2 answers

456 views

Parker-like loop of order 2187?

asked Mar 20, 2011 at 20:04

9 votes

3 answers

3k views

The number of conjugacy classes and the order of the group

asked Oct 8, 2011 at 4:43

8 votes

0 answers

239 views

Involution on sextic polynomials?

asked Mar 4, 2011 at 7:25

8 votes

3 answers

602 views

What other lattices are obtainable from this noncommutative ring?

asked Feb 25, 2020 at 1:17

7 votes

0 answers

882 views

Jordan's Theorem on primitive permutation groups

asked Jan 9, 2012 at 3:08

7 votes

1 answer

2k views

Does the quaternion group Q_8 have a presentation of this form?

asked Jan 30, 2012 at 6:20

7 votes

2 answers

436 views

Subgroup property stronger than being characteristic

asked Jul 2, 2014 at 22:19

7 votes

3 answers

2k views

Counting cyclic subgroups of order $p^{2}$: $p$ an odd prime vs. $p=2$

asked Oct 21, 2015 at 19:14

5 votes

1 answer

539 views

A 'generalized Four Squares Theorem'?

asked Aug 21, 2011 at 7:28

5 votes

2 answers

272 views

Doubly covering an even lattice

asked Mar 14, 2012 at 21:00

5 votes

1 answer

1k views

A solvability theorem

asked Feb 8, 2011 at 5:17

4 votes

1 answer

1k views

The range of the Euler totient function and multiplication by 28

asked Aug 2, 2018 at 13:24

3 votes

0 answers

163 views

A non-commutative ring from SU(2)

asked Dec 30, 2012 at 9:32

2 votes

2 answers

484 views

Proving Congruence Without Leech Lattice

asked Jan 29, 2011 at 22:29

0 votes

0 answers

526 views

Known and unknown about Ramanujan's tau function

asked Mar 16, 2013 at 10:59

0 votes

1 answer

176 views

What are these subgroups called? [closed]

asked Nov 23, 2013 at 1:30

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23 Questions

Is there a Mathieu groupoid M_31?

Maximal Sylow 2-subgroups of simple groups

Efficient presentations for finite groups

(A very limited instance of) Lagrange's Theorem's converse and A_5

Orders of automorphism groups of p-groups

Larger cycle than 4, 2, 1 in Collatz iteration?

All maximal subgroups have odd index

Parker-like loop of order 2187?

The number of conjugacy classes and the order of the group

Involution on sextic polynomials?

What other lattices are obtainable from this noncommutative ring?

Jordan's Theorem on primitive permutation groups

Does the quaternion group Q_8 have a presentation of this form?

Subgroup property stronger than being characteristic

Counting cyclic subgroups of order $p^{2}$: $p$ an odd prime vs. $p=2$

A 'generalized Four Squares Theorem'?

Doubly covering an even lattice

A solvability theorem

The range of the Euler totient function and multiplication by 28

A non-commutative ring from SU(2)

Proving Congruence Without Leech Lattice

Known and unknown about Ramanujan's tau function

What are these subgroups called? [closed]