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- W1597178391 abstract "We introduce semi-perfect obstruction theory of a Deligne-Mumford stack $X$ consisting of local perfect obstruction theories with weak comparisons on overlaps. We show that semi-perfect obstruction theory shares similar properties with perfect obstruction theory. We use semi-perfect obstruction theory to construct virtual cycles of moduli of derived objects on Calabi-Yau threefolds. In the revision, we assume the existence of obstruction sheaf and put the (coarse moduli of the) intrinsic normal cone inside the obstruction sheaf. This avoids the issue of descent of bundle stacks of the local obstruction complexes." @default.
- W1597178391 created "2016-06-24" @default.
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- W1597178391 date "2011-05-17" @default.
- W1597178391 modified "2023-09-27" @default.
- W1597178391 title "Semi-Perfect Obstruction theory and DT Invariants of Derived Objects" @default.
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