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On mixed-$\omega$-sheaves

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arxiv 1908.00171 v3 pith:NHSLXWGQ submitted 2019-08-01 math.AG

classification math.AG
keywords omegasheavesmixed-conjecturemakenakayamanotionaccessible
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abstract

We introduce the notion of mixed-$\omega$-sheaves and use it for the study of a relative version of Fujita's freeness conjecture. It is related to the Iitaka conjecture. We note that the notion of mixed-$\omega$-sheaves is a generalization of that of Nakayama's $\omega$-sheaves in some sense. One of the main motivations of this paper is to make Nakayama's theory of $\omega$-sheaves more accessible and make it applicable to the study of log canonical pairs.

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