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Derived category of projectivization and generalized linear duality

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 Added by Qingyuan Jiang
 Publication date 2018
  fields
and research's language is English




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In this note, we generalize the linear duality between vector subbundles (or equivalently quotient bundles) of dual vector bundles to coherent quotients $V twoheadrightarrow mathscr{L}$ considered in arXiv:1811.12525, in the framework of Kuznetsovs homological projective duality (HPD). As an application, we obtain a generalized version of the fundamental theorem of HPD for the $mathbb{P}(mathscr{L})$-sections and the respective dual sections of a given HPD pair.



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In this paper, we first show a projectivization formula for the derived category $D^b_{rm coh} (mathbb{P}(mathcal{E}))$, where $mathcal{E}$ is a coherent sheaf on a regular scheme which locally admits two-step resolutions. Second, we show that flop-flop=twist results hold for flops obtained by two different Springer-type resolutions of a determinantal hypersurface. This also gives a sequence of higher dimensional examples of flops which present perverse schobers, and provide further evidences for the proposal of Bondal-Kapranov-Schechtman [BKS,KS]. Applications to symmetric powers of curves, Abel-Jacobi maps and $Theta$-flops following Toda are also discussed.
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