Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with cohomology
Search options not deleted
user 5952
A branch of algebraic topology concerning the study of cocycles and coboundaries. It is in some sense a dual theory to homology theory. This tag can be further specialized by using it in conjunction with the tags group-cohomology, etale-cohomology, sheaf-cohomology, galois-cohomology, lie-algebra-cohomology, motivic-cohomology, equivariant-cohomology, ...
18
votes
3
answers
3k
views
Lifting varieties to characteristic zero.
If that succeeds, compute de Rham cohomology of the lift over $W_k$ instead, which in general will be much easier to do. … Neglecting torsion, this de Rham cohomology is the same as the crystalline cohomology of $X$. …
- 4,015
7
votes
2
answers
4k
views
Singular homology of a graph.
We can define singular cohomology accordingly, and get then a natural pairing between homology and cohomology. … (c) Is there a Künneth morphism in singular cohomology? --is there a natural ring strucure on cohomology?
(d) What is a homotopy between morphisms of graphs? …
- 4,015
7
votes
0
answers
723
views
Integral decomposition of the diagonal (Chow motives)
\ldots, e_n$ in the Chow group $\mathrm{CH}^d(X\times X)\otimes \mathbb Q$ which sum up to the diagonal $\Delta \subseteq X\times X$, and induce the projections $H^\ast(X,F) \to H^i(X,F)$ in any Weil cohomology … , say singular cohomology with $F=\mathbb Z$ and $\ell$-adic cohomology with $F = \mathbb Z_\ell$? …
- 4,015