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Ville Salo

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16 Questions

Votes Activity Newest Views

votes

answers

views

If the center of a finite group is trivial, are there two elements whose centralizers intersect trivially?

gr.group-theory

Apr 24 '18 at 20:38 YCor 37.9k

votes

answers

302

views

Is homeomorphism of simplicial complexes semidecidable?

gn.general-topology computability-theory

Sep 13 '18 at 16:38 Ville Salo 2,444

votes

answers

162

views

Does the Angel have to be really smart?

computational-complexity combinatorial-game-theory

Jun 2 at 2:12 Ville Salo 2,444

votes

answer

372

views

Can matrices over $F[G]$ have infinite order when $G$ is periodic?

gr.group-theory

Oct 10 at 12:19 Ville Salo 2,444

votes

answer

147

views

Is there a prefix-continuous bijection between finite words and eventually zero words?

co.combinatorics geometric-group-theory combinatorics-on-words

May 28 at 16:24 Pierre PC 1,403

votes

answer

213

views

Which groups contain a comb?

gr.group-theory graph-theory geometric-group-theory

Mar 20 '19 at 14:16 Ville Salo 2,444

votes

answers

191

views

How can you order a free group?

gr.group-theory order-theory free-groups ordered-groups

Feb 9 at 10:06 Community♦ 1

votes

answers

207

views

Reversible polynomial circuit = polynomial reversible circuit?

gr.group-theory finite-groups computational-complexity permutations

Oct 24 at 7:55 Ville Salo 2,444

votes

answers

views

Topologically mixing cellular automata on groups

gr.group-theory ds.dynamical-systems cellular-automata

Jun 30 at 9:34 Ville Salo 2,444

votes

answer

131

views

Monotile that tiles when you apply a rubber band

mg.metric-geometry discrete-geometry tiling physics

Jun 14 at 8:39 Ville Salo 2,444

votes

answer

142

views

Convex sets on the discrete Heisenberg group

gr.group-theory convex-geometry

Dec 15 at 21:29 YCor 37.9k

votes

answers

154

views

$V$-like actions of $V$

co.combinatorics gr.group-theory geometric-group-theory combinatorics-on-words

May 30 at 7:37 Community♦ 1

votes

answers

views

Are there finitely-presented astral monoids?

semigroups-and-monoids

Oct 4 at 14:01 Ville Salo 2,444

vote

answers

230

views

Impredictable subsets of $\mathbb{N}$

computability-theory

Mar 12 at 8:38 Ville Salo 2,444

votes

answers

views

Is there a reversible fully polynomial-time approximation scheme for polygonal billiards?

discrete-geometry computational-complexity billiards

Jul 6 at 17:11 Ville Salo 2,444

votes

answers

views

QI-closure of $\mathrm{NA}\times\mathrm{NA}$

gr.group-theory geometric-group-theory

May 19 at 23:29 Ville Salo 2,444

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16 Questions

If the center of a finite group is trivial, are there two elements whose centralizers intersect trivially?

Is homeomorphism of simplicial complexes semidecidable?

Does the Angel have to be really smart?

Can matrices over $F[G]$ have infinite order when $G$ is periodic?

Is there a prefix-continuous bijection between finite words and eventually zero words?

Which groups contain a comb?

How can you order a free group?

Reversible polynomial circuit = polynomial reversible circuit?

Topologically mixing cellular automata on groups

Monotile that tiles when you apply a rubber band

Convex sets on the discrete Heisenberg group

$V$-like actions of $V$

Are there finitely-presented astral monoids?

Impredictable subsets of $\mathbb{N}$

Is there a reversible fully polynomial-time approximation scheme for polygonal billiards?

QI-closure of $\mathrm{NA}\times\mathrm{NA}$