Abstract :
In the context of finite-dimensional cocommutative Hopf algebras, we prove versions of various group cohomology results: the Quillen–Venkov theorem on detecting nilpotence in group cohomology, Chouinardʹs theorem on determining whether akG-module is projective by restricting to elementary abelianp-subgroups ofG, and Quillenʹs theorem which identifies the cohomology ofG, “modulo nilpotent elements.” This last result is only proved for graded connected Hopf algebras.
