bio  website  

location  Jacobs University  
age  37  
visits  member for  5 years 
seen  Jan 25 at 16:20  
stats  profile views  839 
1d

awarded  Yearling 
Oct 17 
awarded  Popular Question 
Oct 16 
awarded  Nice Answer 
Sep 11 
awarded  Nice Question 
Sep 8 
comment 
In what sense is the classification of all finite groups “impossible”?
@StefanKohl: Well, I take CFSG as a complete classification, even though it does not answer all questions that one can pose about the finite simple groups. Such a listing would be perfectly OK. My question is, whether there are any obvious obstruction that one cannot expect to come up with such a list for all groups. For instance, the classification of the groups of order $p^n$ gets increasingly complicated with $n$, but so does the classification of $n \times n$ matrices up to conjugacy (Jordan form), so in what sense is the classification of groups of prime power "impossible"? 
Sep 8 
asked  In what sense is the classification of all finite groups “impossible”? 
Aug 24 
awarded  Nice Answer 
Aug 23 
comment 
A question about “Zariski dense” arguments
Yes, but there is no "subtraction" possible in the space $Y$ above. Let me rephrase the argument: the set of matrices $A$ with $p_A(A)=0$ is closed, (because it is the preimage of $0$ under the map $ A \mapsto p_A(A)$ that $\{ 0 \}$). Since it contains a dense set, it has to be the entire space. You do not need to use the diagonal. 
Aug 23 
answered  A question about “Zariski dense” arguments 
Aug 6 
comment 
$p$adic analogues of $SO(3)$
user52824: Thank you for the enlightening comment. I soon have to deal with several other cases (including different ${\mathbf Q}_p$forms of ${\mathrm{SO}}_4$.) It would be great if you could please provide a reference that explains how to systematically find all these forms. 
Aug 5 
comment 
$p$adic analogues of $SO(3)$
thank you for the comment! 
Aug 5 
accepted  $p$adic analogues of $SO(3)$ 
Aug 5 
asked  $p$adic analogues of $SO(3)$ 
Aug 5 
accepted  Orbits of an action of maximal compact subgroups of padic orthogonal groups 
Jul 14 
accepted  is there a padic implicit function theorem? 
Jul 14 
comment 
is there a padic implicit function theorem?
Thank you very much! Analytic would do! 
Jul 13 
asked  is there a padic implicit function theorem? 
Jul 13 
comment 
Orbits of an action of maximal compact subgroups of padic orthogonal groups
Thanks you very much for the detailed answer. I am trying to understand it now. 
Jul 12 
asked  Orbits of an action of maximal compact subgroups of padic orthogonal groups 
Jul 2 
awarded  Curious 