bio  website  Mail:firstname.lastnameatgmai… 

location  Regensburg, Germany  
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1d

reviewed  Reject suggested edit on complexanalysis tag wiki 
1d

reviewed  Approve suggested edit on how to solve 3 6degree polynomial equations for 3 variables? 
Nov 19 
comment 
What is your favorite ADEstyle classification?
It's more an AC/DC style classification 
Nov 19 
reviewed  Approve suggested edit on Classification of the Kähler Structures on the Sphere 
Nov 17 
awarded  Necromancer 
Nov 16 
comment 
The category of abelian group objects
I very much doubt that this is true. The category of abelian groups in a topos has lots of very nice properties and general abelian categories can probably get much wilder than that. Take for example the category of finitely generated Rmodules for a noncommutative leftnoetherian ring R. It is abelian and has no obvious tensor structure, while abelian group objects in a topos have the obvious closed monoidal structure with all its good properties. I can't think of a proof that this is a counterexample, though... 
Nov 2 
reviewed  Approve suggested edit on matheducationhistory tag wiki excerpt 
Oct 28 
reviewed  Approve suggested edit on Polygamous stable marriage/ assignment problem 
Oct 22 
reviewed  Close Parity of primes 
Oct 19 
awarded  Yearling 
Oct 18 
comment 
Number Theory over $\mathbb{F}_q [t]$, why is it important/interesting?
The AxKochen theorem is an early example of how one can infer theorems on number fields from the analogous ones on function fields. The wikipedia page has a good summary: en.wikipedia.org/wiki/Ax%E2%80%93Kochen_theorem 
Oct 18 
reviewed  Approve suggested edit on binaryquadraticforms tag wiki excerpt 
Oct 17 
awarded  Nice Answer 
Sep 29 
reviewed  Approve suggested edit on Who first showed that $SL(n,O_K)$ is a lattice for a number ring $O_K$? 
Sep 29 
reviewed  Approve suggested edit on Restricting the Steinberg representation of $SL_{2n}$ over a finite field to the symplectic group 
Sep 27 
reviewed  Reviewed cardinality of perfect sets in generalized Baire space 
Sep 27 
awarded  Custodian 
Sep 26 
reviewed  Leave Open Can any reductive $k$group be written as a semidirect product of $k$linear groups? 
Sep 26 
reviewed  Reject suggested edit on lattices tag wiki 
Sep 23 
comment 
Continuous relations?
Here is a bunch of proposals for a notion of smoothness for setvalued functions. Most can be downgraded to continuity: mathoverflow.net/q/38059/733 