Second symmetric powers of chain complexes

Details Second symmetric powers of chain complexes Second symmetric powers of chain complexes

2008-08-29

arxiv.org/abs/0809.0018v3

Mathematics

Commutative Algebra

25 pages, uses xypic. v.2: introduction revised, Theorem 3.1 generalized with part in new Corollary 3.2, and minor changes mad

Scientific paper

We investigate Buchbaum and Eisenbud's construction of the second symmetric power S^2_R(X) of a chain complex X of modules over a commutative ring R. We state and prove a number of results from the folklore of the subject for which we know of no good direct references. We also provide several explicit computations and examples. We use this construction to prove the following version of a result of Avramov, Buchweitz, and Sega: Let R \to S be a module-finite ring homomorphism such that R is noetherian and local, and such that 2 is a unit in R. Let X be a complex of finite rank free S-modules such that X_n = 0 for each n < 0. If \cup_n Ass_R(H_n(X \otimes_S X)) \subseteq Ass(R) and if X_P \simeq S_P for each P \in Ass(R), then X \simeq S.

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