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Théorie de Kummer-Artin-Schreier. (Kummer-Artin-Schreier theory). (French) Zbl 0743.14030
The authors propose a theory relying on the theories of Kummer and Artin- Schreier. They prove the universality of an isogeny of group schemes for cyclic étale coverings of degree $$p$$ over a base of mixed characteristic 0 and $$p$$.

##### MSC:
 14K02 Isogeny 14L15 Group schemes 14E20 Coverings in algebraic geometry
##### Keywords:
isogeny of group schemes; cyclic étale coverings