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Derivator Six-Functor-Formalisms -- Construction II

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arxiv 1902.03625 v3 pith:LMJEXR2M submitted 2019-02-10 math.AG math.CT

classification math.AGmath.CT
keywords derivatorsix-functor-formalismsformalismabelianallowsaxiomscategoriesclassical
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Starting from simple and necessary axioms on a (derivator enhanced) four-functor-formalism, we construct derivator six-functor-formalisms using compactifications. This works, for instance, for the stable homotopy categories of Morel-Voevodsky-Ayoub, and also for the classical setting of unbounded complexes of sheaves of Abelian groups on `nice' topological spaces. The formalism of derivator six-functor-formalisms elegantly encodes all isomorphisms between compositions of the six functors (and their compatibilities) and moreover it gives coherent enhancements over diagrams of correspondences. Such a formalism allows to extend six-functor-formalisms to stacks using (co)homological descent.

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  1. Grothendieck Duality theories -- abstract and concrete, I: pseudo-coherent finite maps

    math.AG 2019-08 conditional novelty 6.0 of 10

    For pseudo-coherent finite maps of schemes, this preprint proves the concrete dualizing pseudofunctor f^♭ is isomorphic to the abstract f^!, and gives explicit comparisons for tensor, Hom, and Koszul-regular immersions.

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