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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

2 votes

How can one show that orbit closures in representations of a linear quiver don't have small ...

If you can prove that the variety is $\mathbb{Q}$-factorial but singular then it has no small resolution by the purity of the exceptional locus: the exceptional locus is a divisor which is contracted …
Nicolas Perrin's user avatar