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seen Mar 17 '11 at 0:55

Feb
9
answered Singular semi-Riemannian Geometry: usefulness and state of the art
Oct
14
comment Propagation of an error in the LMO invariant? (Revision: I don't think LMO is wrong!)
I was supposed to add a question mark.
Oct
14
comment Propagation of an error in the LMO invariant? (Revision: I don't think LMO is wrong!)
I just came here for a little explanation of the LMO invariant. I have no idea what it is. Could you tell me a little something about it. I know nothing of topology and or knot theory.
Oct
13
answered Relationship between Tangent bundle and Tangent sheaf
Oct
9
comment Counterexamples in Algebra?
What's the difference between formally unramified and unramified?
Oct
9
comment Counterexamples in Algebra?
omg what's an epimorphism then?
Oct
7
comment Automorphism Group of (R/p^nR)[x]
Wait, I don't think evaluation maps are allowed. $\mathrm{Aut}_R$ is not a functor.
Oct
7
comment Automorphism Group of (R/p^nR)[x]
-Yes, for me $\mathrm{AL}_1 = \mathrm{Aff}(1,R/pR)$ the affine linear group. -The application is to $R = \mathcal O(U_{ij})$ where $\mathcal O$ is a sheaf of rings and $U_{ij}=U_i\cap U_j$, the intersection of two affine open sets in a cover. The Automorphism is induced by two local trivializations on special subsets of a (formal) scheme over another scheme. I'm actually interested in the automorphisms of $R[x]^{\wedge}$ which corresponds to the completion of a scheme at a prime $p$. Evaluations maps don't help me too much.
Oct
7
awarded  Student
Oct
7
asked Automorphism Group of (R/p^nR)[x]
Oct
6
comment Torsors in Algebraic Geometry?
Stupid Question: What's the non-cech H^1 when G is non-abelian?
Sep
13
awarded  Supporter
Sep
9
asked Give me your most general form of the chinese remainder theorem.
Sep
9
answered Interpretation of the Second Incompleteness Theorem
Sep
9
answered Is there an underlying explanation for the magical powers of the Schwarzian derivative?
Aug
31
awarded  Teacher
Aug
23
answered Is it useful to consider cohomology of group representations?