A hodge-type decomposition for commutative algebra cohomology
A hodge-type decomposition for commutative algebra cohomology
复制标题
DOI:
10.1016/0022-4049(87)90112-5
复制
发表时间:
1987-09
影响因子:
0.8
通讯作者:
M. Gerstenhaber;S. D. Schack
中科院分区:
文献类型:
--
作者:
M. Gerstenhaber;S. D. Schack
The Hochschild cohomology of a commutative algebra A of characteristic zero, with coefficients in a symmetric module M, decomposes into a direct sum H n (A, M)= H 1, n− 1+∣+ H n, 0, where H i, n− i is the eigenspace for the eigenvalue 2 i− 2 of the ‘shuffle operator‘s n. Harrison's cohomology is H 1.(= Σ i H 1, i). Replacing every module in a long exact sequence 0→ M→ M n∣→ M 1 a ̊ A→ 0 of A-bimodules (with M i not necessarily symmetric) by its opposite induces an involution, op, on H.. This is an automorphism of the cup product when M= A. The set of fixed elements is the direct sum of H i. when i even.