Impact
~90k
people reached
- 0 posts edited
- 2 helpful flags
- 309 votes cast
Nov
10 |
comment |
What are some very important papers published in non-top journals?
@GerryMyerson: Indeed, thanks! |
Nov
8 |
comment |
What are some very important papers published in non-top journals?
I think there was a similar question (which I can't find right now) about important original theorems appearing in books rather than journals. The Dicks-Dunwoody almost stability theorem comes to mind (although it is slightly before the cutoff date). |
Oct
27 |
comment |
A generalization of residual finiteness to topological groups
A discrete cocompact normal subgroup $\Lambda$ is already a lot to ask for. For instance, if your group is compactly generated, then any such $\Lambda$ must have open centraliser, so if $G$ is connected then $\Lambda$ would be central, and if $G$ is totally disconnected you'd have a finite index subgroup of the form $\Lambda \times U$ where $U$ is a compact open subgroup. |
Oct
22 |
revised |
Not especially famous, long-open problems which anyone can understand
added 207 characters in body |
Oct
22 |
answered | Not especially famous, long-open problems which anyone can understand |
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). |