bio | website | |
---|---|---|
location | ||
age | 31 | |
visits | member for | 5 years, 5 months |
seen | yesterday | |
stats | profile views | 1,146 |
A nomadic postdoc, currently in Australia.
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. |
Dec 22 |
revised |
Powers in compact coset spaces
added 15 characters in body |
Dec 22 |
comment |
Powers in compact coset spaces
Ah yes, I see the issue there if $G$ is not metrisable. Yes, a net is fine. |
Dec 22 |
asked | Powers in compact coset spaces |
Dec 17 |
awarded | Good Question |