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Sep
23 |
revised |
Just-not-nilpotent-by-compact quotient of a locally compact group
added 73 characters in body |
Sep
23 |
answered | Just-not-nilpotent-by-compact quotient of a locally compact group |
Sep
16 |
comment |
Actions on spaces with measured walls
Groups acting on $\mathbb{R}$-trees could be a good special case to consider. |
Sep
14 |
awarded | Civic Duty |
Jul
22 |
comment |
Torsion in profinite groups
Grigorchuk's group is a p-group, but its profinite completion is not. As far as I know, it is still an open question as to whether there exists a profinite group with infinite exponent, but no elements of infinite order. |
Jun
2 |
answered | Solving algebraic problems with topology |
May
23 |
awarded | Popular Question |
May
13 |
revised |
Continuity of conjugation actions of Polish groups
added 335 characters in body; added 7 characters in body |
May
13 |
answered | Continuity of conjugation actions of Polish groups |
May
12 |
comment |
Continuity of conjugation actions of Polish groups
Yes, the topology of $G$ can in general be finer than that of $\psi(G)$. |
May
12 |
revised |
Continuity of conjugation actions of Polish groups
added 73 characters in body |
May
12 |
reviewed | Approve Random graphs with boundary in a game (Tsuro) |
May
12 |
asked | Continuity of conjugation actions of Polish groups |
May
5 |
awarded | Nice Answer |
Apr
22 |
comment |
When is it appropriate to name something a 'fundamental lemma'?
Another option is to attach the name of the original authors to the lemma, so it becomes 'X's Lemma' rather than 'Lemma 5.63'. It depends if the use of the lemma was pioneered by a specific set of authors, or if it is of uncertain 'folklore' origin and/or has been repeatedly rediscovered by different authors (the latter is a good sign of a 'fundamental' lemma). |
Apr
13 |
asked | Topological systems of imprimitivity |
Apr
2 |
comment |
Should one post a paper on the arXiv if it is not intended to be published?
The novelty threshold for putting something on the arXiv is lower than for a typical journal article. For instance, I would not be surprised to see notes from a postgrad-level study group up there, if the topic was something that has not yet been standardised into textbook form. If it's something that could be useful to research-level mathematicians, then go ahead. |
Feb
17 |
awarded | Yearling |
Dec
22 |
comment |
Powers in compact coset spaces
Good point about sequential compactness. It looks like a net would work for the $\mathbb{T}^{\mathbb{T}}$ example. |
Dec
22 |
comment |
Powers in compact coset spaces
If $G$ is t.d.l.c. and $K$ is normal, it reduces to the profinite case, which is indeed easy. I'm wondering what happens if $K$ is not normal. |