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location Regensburg, Germany
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visits member for 5 years, 1 month
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1d
reviewed Reject suggested edit on complex-analysis tag wiki
1d
reviewed Approve suggested edit on how to solve 3 6-degree polynomial equations for 3 variables?
Nov
19
comment What is your favorite ADE-style 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 R-modules for a noncommutative left-noetherian 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 math-education-history 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 Ax-Kochen 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 binary-quadratic-forms 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 set-valued functions. Most can be downgraded to continuity: mathoverflow.net/q/38059/733