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- W2080785703 abstract "Let A be a commutative algebra over a field of characteristic zero, and M be a symmetric A-bimodule. Gerstenhaber and Schack have shown that there are Hodge-type decompositions H n ( A , M ) = ⊕ k H k , n − k ( A , M ), H n ( A , M ) = ⊕ k H k , n − k ( A , M ) of the Hochschild (co)homology. The first summands H 1, n − 1 ( A , M ), H 1, n − 1 ( A , M ) are known to be the Harrison (co)homology defined in terms of shuffles. We discuss interpretations of the decompositions in terms of k-shuffles and how these relate to versions of the Poincaré-Birkoff-Witt theorem. We then turn to a detailed study of how the decomposition behaves with respect to the Gerstenhaber operations (cup and Lie products) in cohomology. We show by example that neither product is generally graded, but that F q = ⊕ r ≥ q H ∗,r (A, A) are ideals for both products with F p ∪ F q ⊆ F p + q and [ F p , F q ]⊆ F p + q . The results for the cup product were conjectured by Gerstenhaber and Schack." @default.
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- W2080785703 date "1995-11-01" @default.
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- W2080785703 title "The decomposition of Hochschild cohomology and Gerstenhaber operations" @default.
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- W2080785703 doi "https://doi.org/10.1016/0022-4049(94)00136-7" @default.
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