Deformation cohomology for Yetter-Drinfel'd modules and Hopf (bi)modules

Florin Panaite, Dragos Stefan

If A is a bialgebra over a field k and M, N are either left-right Yetter-Drinfel'd modules or left-right Hopf modules over A, we construct deformation cohomologies H^*(M,N) as tota…