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YCor
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35 votes
3 answers
1k views

Second Betti number of lattices in $\mathrm{SL}_3(\mathbf{R})$

27 votes
2 answers
1k views

Sustainability of ZBmath unrestricted access

26 votes
1 answer
1k views

Group with finite outer automorphism group and large center

19 votes
1 answer
742 views

Is Thompson's group definably orderable?

17 votes
1 answer
360 views

Finitely generated groups with Hölder-exotic space of ends?

14 votes
2 answers
481 views

Near permutation $n\mapsto n+1$ not conjugate to its inverse on the Stone-Čech remainder?

13 votes
1 answer
440 views

Variety of nilpotent Lie algebras or $p$-groups

13 votes
2 answers
445 views

Linear occurrences of finite simple groups

13 votes
1 answer
417 views

Locally finite groups containing all finite groups

10 votes
1 answer
382 views

Generalized cancelation properties ensuring a monoid embeds into a group

10 votes
1 answer
343 views

Elementary equivalence between $n\mapsto n+1$ and its inverse on the Stone-Čech remainder?

10 votes
0 answers
279 views

Quotients by algebraic group actions at the level of the Grothendieck ring

9 votes
1 answer
524 views

Units of group algebra of dihedral group

8 votes
0 answers
147 views

Finite groups with unbounded commutator width and no nontrivial central chief factor

8 votes
0 answers
236 views

Sequences for which $\prod (1-z^n)^{a(n)}$ is a polynomial

7 votes
1 answer
267 views

Is a 8-dimensional quadratic form recognized by its Lie algebra, modulo equivalence and scalar multiplication?

7 votes
1 answer
189 views

Free median algebras and maximal linked systems

5 votes
2 answers
299 views

Self-homeomorphism of Stone-Čech boundary with an isolated fixed point

5 votes
1 answer
204 views

Permutations of a group that are eventually left translations

5 votes
0 answers
145 views

One-parameter family of algebra structures: characterizing trivial deformation as adjoint 2-cocycle being a 2-coboundary

5 votes
1 answer
309 views

"Dimension" of discrete subgroups of infinite covolume in Lie groups

4 votes
1 answer
181 views

Splitting of central extension read on 2-Sylow?

3 votes
1 answer
192 views

Centralizer of a single element in the monoid of self-maps of a set

3 votes
2 answers
203 views

Polynomial identities of supercommutative-gradable algebras