## Flat cohomology for finite infinitesimal group scheme over a perfect field

Let $G$ be a finite infinitesimal group scheme (e.g.$\mu_p,\alpha_p)$ over a perfect field $k$, how much is known about $H^1_{fppf}(k,G)$?

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 What precisely do you want to know about it? – Kestutis Cesnavicius Jan 27 at 12:30 I know for $\mu_p$ and $\alpha_p$ these are trivial. Do I have more examples? Are these all trivial for commutative finite groups? – stefan Jan 27 at 14:04 Sorry, I meant for commutative finite infinitesimal groups. – stefan Jan 27 at 14:25 @stefan: Use the connected-etale sequence to see the triviality whenever $G$ is commutative and infinitesimal. – ayanta Jan 27 at 14:34