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Global Frobenius Liftability II: Surfaces and Fano Threefolds

In this article, a sequel to "Global Frobenius Liftability I" (math:1708:03777v2), we continue the development of a comprehensive theory of Frobenius liftings modulo $p^2$. We study compatibility of divisors and closed subschemes with Frobenius liftings, Frobenius liftings of blow-ups, descent under quotients by some group actions, stability under base change, and the properties of associated F-splittings. Consequently, we characterise Frobenius liftable surfaces and Fano threefolds, confirming the conjecture stated in our previous paper.

preprint2021arXivOpen access
Piotr AchingerJakub WitaszekMaciej Zdanowicz
math.AG
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Piotr AchingerJakub WitaszekMaciej Zdanowicz

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