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YCor
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Selected answers:

Centralizers of pairs in monoids of self-maps

When do two non-degenerate quadratic forms give rise to isomorphic Lie algebras?

A question about subsets of plane (or: how to apply the notion of commensurating action to a plane geometry question);

Finitely generated soluble groups with uncountably many maximal subgroups

Example of reflective subcategory of (Groups) whose reflector doesn't preserve finite products

divisors of $p^4+1$ of the form $kp+1$

Infinitely many finitely generated groups having the same Cayley graph

Do constructible sets have Krull dimension?

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66
In a topological space if there exists a loop that cannot be contracted to a point does there exist a simple loop that cannot be contracted also?
Aug 8, 2019
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58
How can a mathematician handle the pressure to discover something new?
Mar 11, 2018
answer
48
Is there a smallest group containing all finite groups?
Oct 24, 2022
answer
40
Are infinite groups in which most elements have order $\leq 2$ commutative?
Sep 18, 2018
answer
37
divisors of $p^4+1$ of the form $kp+1$
Jun 7, 2015
answer
37
Bourbaki's definition of the number 1
Apr 15, 2020
answer
36
Does GL_n(Z) have a noetherian group ring?
May 3, 2014
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35
Second Betti number of lattices in $\mathrm{SL}_3(\mathbf{R})$
Oct 27, 2018
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32
Does there exists a group structure on $\circ$ on $(\mathbb{R},\circ)$ such that $(\mathbb{R},\circ)$ is non-isomorphic to $(\mathbb{R},+)$?
Aug 25, 2018
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31
Is SO(4) a subgroup of SU(3)?
Nov 16, 2021
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Under what conditions is the exponential map on a Lie algebra injective?
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Burnside group $B(2, 3)$, how to see has $27$ elements and isomorphic to certain group?
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Alternative proofs that $A_5$ is simple

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