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Numerical Kodaira dimension of algebraic fiber spaces in positive characteristic

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arxiv 2212.09245 v3 pith:247BL2JN submitted 2022-12-19 math.AG

classification math.AG
keywords characteristicpositivetheoremalgebraiccanonicaldimensionfibergeneration
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In this paper, we prove a positive characteristic analog of Nakayama's inequality on the numerical Kodaira dimension of algebraic fiber spaces when the generic fibers have nef canonical divisors. To this end, we establish variants of Popa and Schnell's global generation theorem, Viehweg's weak positivity theorem and Fujino's global generation theorem in positive characteristic. As a byproduct, we show that Iitaka's conjecture holds true in positive characteristic when the base space is of general type and the canonical divisor of the total space is relatively semi-ample.

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  1. Generic vanishing theory in positive characteristic

    math.AG 2025-07 conditional novelty 5.0 of 10

    The paper proves an equivalence between Cartier crystals and V-crystals on dual abelian varieties and derives H^0(X,ω_X)≠0, with S^0(X,ω_X)≠0 in the ordinary case, for normal proper varieties of maximal Albanese dimension.

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