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arxiv: 1707.07347 · v2 · pith:6MKEIR2Tnew · submitted 2017-07-23 · 🧮 math.AG

Seshadri constants for curve classes

classification 🧮 math.AG
keywords seshadriconstantsamplenessanaloguesarbitraryasymptoticaugmentedbase
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We develop a local positivity theory for movable curves on projective varieties similar to the classical Seshadri constants of nef divisors. We give analogues of the Seshadri ampleness criterion, of a characterization of the augmented base locus of a big and nef divisor, and of the interpretation of Seshadri constants as an asymptotic measure of jet separation. We also study the case of arbitrary codimension.

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  1. Pseudo-effectivity of the relative canonical divisor and uniruledness in positive characteristic

    math.AG 2020-09 unverdicted novelty 7.0

    K_{X/T} is pseudo-effective when f: X→T has non-uniruled generic fiber in char p>0.