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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? |