A note on Frobenius divided modules in mixed characteristics

Autor:	Berthelot, Pierre
Rok vydání:	2010
Předmět:	Mathematics - Algebraic Geometry Mathematics - Commutative Algebra Mathematics - Number Theory Mathematics - Rings and Algebras
Druh dokumentu:	Working Paper
Popis:	If $X$ is a smooth scheme over a perfect field of characteristic $p$, and if $\sD_X$ is the sheaf of differential operators on $X$ [EGAIV], it is well known that giving an action of $\sD_X$ on an $\sO_X$-module $\sE$ is equivalent to giving an infinite sequence of $\sO_X$-modules descending $\sE$ via the iterates of the Frobenius endomorphism of $X$. We show that this result can be generalized to any infinitesimal deformation $f : X \to S$ of a smooth morphism in characteristic $p$, endowed with Frobenius liftings. We also show that it extends to adic formal schemes such that $p$ belongs to an ideal of definition. In a recent preprint, dos Santos used this result to lift $\sD_X$-modules from characteristic $p$ to characteristic 0 with control of the differential Galois group. Comment: 16 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1003.2571 Zobrazit plný text záznamu View this record from Arxiv