Abstract
We show that for any bimodule M and bicomodule C of a Hopf algebra H with involutive antipode, Hochschild complex and are cocyclic -modules. Their para-cocyclic operators are compatible in Gerstenhaber-Schack bicomplex of a Hopf algebra morphism which is a combination of Hochschild complex and coHochschild complex for any and make the bicomplex into a cylindrical -module under appropriate conditions. From this bicomplex, we get a cocyclic structure of the diagonal complex. With these cocyclic operators, the operadic structure of the diagonal complex is cyclic, so that the Gerstenhaber algebra structure on the diagonal cohomology evolves into a Batalin-Vilkovisky algebra. Hence we obtain the structure of Gerstenhaber-Schack cohomology of which is isomorphic to the diagonal cohomology. Our results can be applied to group algebra and arbitrary G-graded Hopf algebra A. Let be ϵA (resp. uB , idA ). Then we can get the Gerstenhaber structure on Hochschild cohomology (resp. Adams Cobar construction of B, Gerstenhaber-Schack cohomology of A). Moreover, the Gerstenhaber structure operators of ϵA and uB commute with composition.
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