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Finite Flat Group Schemes over Local Artin Rings

Published online by Cambridge University Press:  04 December 2007

René Schoof
Affiliation:
Dipartimento di Matematica, 2a Università di Roma ‘Tor Vergata’, I-00133 Rome, Italy. E-mail: [email protected]
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Abstract

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Let R be a local Artin ring with maximal ideal $\frak m$ and residue class field of characteristic p > 0. We show that every finite flat group scheme over R is annihilated by its rank, whenever $\frak m$p = p$\frak m$ = 0. This implies that any finite flat group scheme over an Artin ring the square of whose maximal ideal is zero, is annihilated by its rank.

Type
Research Article
Copyright
© 2001 Kluwer Academic Publishers