On the cap product in Hochschild theory
Abstract
In this paper, we give an axiomatic characterization of the cap product in the Hochschild theory of associative unital algebras which are projective over a commutative unital ring. We also give an interpretation of the cap product with coefficients in the algebra via chain maps. We illustrate these results by computing the cap product for truncated polynomial algebras k[x]/(xN) and for polynomial algebras, where it is identified with the contraction of differential forms by polyvector fields.
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