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

8 votes
1 answer
639 views

Phantoms and strongly exceptional collections

I would like to ask a question about phantom categories and strongly exceptional collections. Let $X$ be a smooth prpjective variety over an algebraically closed field. An admissible subcategory $B …
3 votes

How to define the intersection multiplicity of a projective variety and a complete intersect...

I think it is difficult to compute the multiplicity just by looking "qualitatively" at the equations. For instance, let $C \subset \mathbb{P}^3$ be a smooth curve over the field of complex numbers. …
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