On the first Hochschild cohomology of cocommutative Hopf algebras of finite representation type

Hao Chang

Let ${\mathcal{B}}_0(\mathcal{G})\subseteq k\mathcal{G}$ be the principal block algebra of the group algebra $k\mathcal{G}$ of an infinitesimal group scheme $\mathcal{G}$ over an alg…