Let X be a n-dimensional complex Stein manifold and F be a perverse sheaf on X. The main result of this paper is that the complex of formal cohomology R1 c (X; F w O X ) [n] is concentrated in degree zero. This result relies on some preliminaries which may have their own interest: flatness of the sh
Complexes and Vanishing of Cohomology for Group Schemes
β Scribed by Christopher P Bendel; Daniel K Nakano
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 318 KB
- Volume
- 214
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
β¦ Synopsis
Completely reducible homology complexes were originally introduced in the context of finite groups and used to study the question of vanishing of cohomology. In this paper we study these complexes and the vanishing of cohomology for arbitrary finite-dimensional cocommutative Hopf algebras. Applications are later provided for infinitesimal group schemes of reductive and solvable algebraic groups.
π SIMILAR VOLUMES
Cohomology rings of finite groups have strong duality properties, as shown by w x w x Benson and Carlson 4 and Greenlees 16 . We prove here that cohomology rings of virtual duality groups have a ring theoretic duality property, which combines the duality properties of finite groups with the cohomolo
We prove that two arithmetically significant extensions of a field F coincide if w x and only if the Witt ring WF is a group ring β«ήβ¬rn G . Furthermore, working modulo squares with Galois groups which are 2-groups, we establish a theorem analogous to Hilbert's Theorem 90 and show that an identity li