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Extension groups of tautological sheaves on Hilbert schemes

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arxiv 1111.4263 v2 pith:4IGL5MU7 submitted 2011-11-18 math.AG

classification math.AG
keywords tautologicalsheavesextensionformulasgroupshilbertbridgeland-king-reidbundle
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We give formulas for the extension groups between tautological sheaves and more general between tautological objects twisted by a determinant line bundle on the Hilbert scheme of points on a smooth quasi-projective surface. We do this using L. Scala's results about the image of tautological sheaves under the Bridgeland-King-Reid equivalence. We also compute the Yoneda products in terms of these formulas.

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  1. Derived categories of Fano varieties of lines

    math.AG 2025-01 conditional novelty 6.0 of 10

    Proves Galkin's derived-equivalence conjecture for generic cubic fourfolds in Hassett divisors with d/2 a perfect square, and establishes the associated weight-two Hodge isometry for all smooth cubic fourfolds.

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