Cup Products on Hochschild Cohomology of Hopf-Galois Extensions.pdf

Liyu Liu, Wei Ren, Shengqiang Wang

In this paper, we give an explicit chain map, which induces the algebra isomorphism between the Hochschild cohomology ${\mathbf{HH}}^{\bullet }(B)$ and the $H$-invariant subalgebra ${\bf…