Étale group scheme

In mathematics, more precisely in algebra, an étale group scheme is a certain kind of group scheme.

Definition

A finite group scheme ${\displaystyle G}$ over a field ${\displaystyle K}$ is called an étale group scheme if it is represented by an étale K-algebra ${\displaystyle {\mathfrak {R}}}$, i.e. if ${\displaystyle {\mathfrak {R}}\otimes _{K}{\bar {K}}}$ is

${\displaystyle {\bar {K}}\times ...\times {\bar {K}}}$

References

• John Voight, Introduction to group schemes (PDF), Dartmouth College (lecture notes)

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