Batalin-Vilkovisky structure over the Hochschild cohomology ring of a   group algebra
  We realize explicitly the well-known additive decomposition of the Hochschild cohomology ring of a group algebra in the elements level. As a result, we describe the cup product, the Batalin-Vilkovisky operator and the Lie bracket in the Hochschild cohomology ring of a group algebra. 
Yu-Ming Liu and Guodong Zhou
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