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ADL
  • Member for 13 years, 10 months
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64 votes
7 answers
14k views

Is Thompson's Group F amenable?

17 votes
1 answer
689 views

Are groups with every proper, non-trivial subgroup infinite cyclic simple?

11 votes
1 answer
1k views

When is an HNN-extension finitely presented?

11 votes
3 answers
1k views

Solutions to some equations in a free group

10 votes
4 answers
2k views

residually finite-by-$\mathbb{Z}$ groups are residually finite

10 votes
1 answer
666 views

Nielsen equivalence in one-relator groups

9 votes
2 answers
350 views

A malnormal embedding theorem?

8 votes
3 answers
704 views

Torsion in triangle groups

8 votes
1 answer
356 views

Linking the residual finiteness of $G$ with $Aut(G)$ or $Out(G)$

8 votes
0 answers
264 views

Subgroups of torsion-free hyperbolic groups versus subgroups of hyperbolic groups

7 votes
0 answers
98 views

A group, all of whose non-trivial mapping tori are finitely presentable?

6 votes
0 answers
251 views

Recursive presentability of outer automorphism group

5 votes
1 answer
242 views

Finite generation of intersections of free subgroups

4 votes
1 answer
373 views

When is a generalised Baumslag-Solitar group linear?

4 votes
2 answers
328 views

When are isomorphic copies of the base group in an $HNN$-extension subgroups of the base group (up to conjugacy)?

3 votes
1 answer
241 views

Free Automorphisms

3 votes
2 answers
157 views

Subsets of free groups contained in $2$-generated subgroups

2 votes
1 answer
290 views

Decision problems and group representations

2 votes
1 answer
595 views

Cubical Complexes and Bass-Serre theory

1 vote
1 answer
205 views

When are fixed point sets in $T_1$ spaces always closed?

0 votes
3 answers
642 views

Center of a Symmetric Group on an Infinite Set