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DavidLHarden's user avatar
DavidLHarden's user avatar
DavidLHarden
  • Member for 12 years, 10 months
  • Last seen more than a month ago
31 votes
0 answers
956 views

Is there a Mathieu groupoid M_31?

12 votes
1 answer
429 views

Maximal Sylow 2-subgroups of simple groups

11 votes
4 answers
1k views

Efficient presentations for finite groups

11 votes
3 answers
903 views

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

10 votes
2 answers
3k views

Orders of automorphism groups of p-groups

10 votes
2 answers
4k views

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

10 votes
1 answer
651 views

All maximal subgroups have odd index

9 votes
2 answers
461 views

Parker-like loop of order 2187?

9 votes
3 answers
3k views

The number of conjugacy classes and the order of the group

8 votes
0 answers
239 views

Involution on sextic polynomials?

8 votes
3 answers
608 views

What other lattices are obtainable from this noncommutative ring?

7 votes
0 answers
887 views

Jordan's Theorem on primitive permutation groups

7 votes
1 answer
2k views

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

7 votes
2 answers
437 views

Subgroup property stronger than being characteristic

7 votes
3 answers
2k views

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

5 votes
1 answer
543 views

A 'generalized Four Squares Theorem'?

5 votes
2 answers
274 views

Doubly covering an even lattice

5 votes
1 answer
1k views

A solvability theorem

4 votes
1 answer
1k views

The range of the Euler totient function and multiplication by 28

3 votes
0 answers
163 views

A non-commutative ring from SU(2)

2 votes
2 answers
485 views

Proving Congruence Without Leech Lattice

0 votes
0 answers
542 views

Known and unknown about Ramanujan's tau function

0 votes
1 answer
176 views

What are these subgroups called? [closed]