3,317 reputation
11738
bio website ucs.louisiana.edu/~avm1260
location Lafayette, LA, USA
age 45
visits member for 5 years, 1 month
seen 7 mins ago

With the move of MathOverflow into the SE network, this account is now associated with dormant accounts in math.SE and other sites in the network. While I plan to continue my (generally low-level) participation in MO, my current plans do not include restarting my participation in those other sites. Therefore, I will be ignoring any comments or pings that reach me from those sites, unless and until I resume my active participation there.

I remain "gone for the foreseeable future" from math.SE, tex.SE, and meta.SE.

Please do not send me private e-mail to call my attention to comments, questions, or other matters related to those sites. Thank you. Also, as I no longer participate in those sites, I do not wish to be sent, by private e-mail, questions that you can just as well ask on those sites. I would have thought it was obvious, but apparently I need to say so explicitly.


6m
reviewed Approve (Non)existence of mirrors with more than two foci
4h
comment About “covering” subgroups
near as I can tell, the condition given in the OP question is equivalent to saying that the cosets of $H$ have the following property: if $H\pi$ intersects every point stabilizer, then $\pi\in H$. In particular, for every coset of $H$ different from $H$ itself, there is a point stabilizer that does not intersect $H$. Seems like "covering" would be a strange term to use in that instance, so clearly the authors are looking at some other interpretation, and as such it is the authors who should be queried as to the origin of that term.
4h
comment About “covering” subgroups
Thanks, @DimaPasechnik. I tried browsing through it but could not see a definition that included the term; then I tried the search.
16h
comment About “covering” subgroups
P.S. The paper you linked to is in the theory of games, which is a mathematical field. Of course, since it is apparently not the paper that contains this definition, perhaps your claim that the paper "is not a mathematical one" will turn out to be correct.
16h
comment About “covering” subgroups
A proper citation includes also the location on the paper in which the concept is to be found; it is unreasonable to expect to expect the people here to wade through 20 pages to find the context of your question. As it is, I did a search for "covering" on the paper you link to. Acrobat could not find a single match. There was also no match for "cover". So... what was the point of the link, if it does not contain what you claim it contains?
18h
comment About “covering” subgroups
What paper was it? Can you give the citation? If it was not mathematical, then why ask about it in a mathematical group, or what makes you think you will get mathematical insight from it? Can you give the explicit, precise quote and context for it? Without doing any of these, it is hard if not impossible to actually answer your question. If you had doubts as to this being the mathematical term, then you should have said so. By giving the precise citation, you can help the process. Otherwise, you are just getting in your own way.
20h
comment About “covering” subgroups
"the authors define $H$ covering" does not make much sense to me. Do they say "$H$ is a covering", or some such? And how about providing a specific reference, rather than "in a paper I read"?
20h
revised About “covering” subgroups
fix punctuation, remove emoticon, spacing, add reference-request tag
Mar
27
revised One question about iteration on groups
readability, notation, grammar
Mar
24
comment Normal subgroup of a totally ordered group
You mean, other than the two obvious ones (trivial and improper)?
Mar
24
revised Is countably complete lattice bounded?
deleted 1 character in body
Mar
14
revised Example of a left perfect ring with finite left global dimension that is not right coherent
better title
Mar
14
revised What is the reduction number of ideal $\langle t^a,t^b,t^c\rangle$?
fix langle and rangle in title
Mar
10
revised $2^n$-1 consisting only of small factors
fix title
Mar
3
reviewed Reject Including a Jordan arc into a Jordan loop (Can the Magi go home by another way?)
Feb
27
reviewed Approve Almost-direct product and 1-formality
Feb
11
awarded  Yearling
Feb
2
reviewed Approve Under which conditions the inclusion of a sub-simplicial set of the nerve of a category is a Joyal equivalence?
Jan
28
comment Categorical proof subgroups of free groups are free?
(My comment was not in the linked question, but it is in this one ).
Jan
28
comment Categorical proof subgroups of free groups are free?
(continued) One would expect a truly "categorical proof" to be something you could do in the context of any variety of groups; but since the conclusion does not hold in most of them, I don't expect you would be able to find such a proof in the first place.