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Finite Group Schemes over Bases with Low Ramification

Published online by Cambridge University Press:  04 December 2007

BRIAN CONRAD
Affiliation:
Department of Mathematics, Harvard University, Cambridge, MA 02138, U.S.A.; e-mail: [email protected]
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Abstract

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Let A$^′$be a complete characteristic (0,p) discrete valuation ring with absolute ramification degree e and a perfect residue field. We are interested in studying the category${\mathcal F}$${\mathcal F}$$_A$$_′$of finite flat commutative group schemes over A$^′$withp-power order. When e= 1, Fontaine formulated the purely ’linear algebra‘ notion of a finite Honda system over A$^′$and constructed an anti-equivalence of categories between${\mathcal F}$${\mathcal F}$$_A$$_′$and the category of finite Honda systems over A$^′$ when p< 2. We generalize this theory to the case e≤ − 1.

Type
Research Article
Copyright
© 1999 Kluwer Academic Publishers