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

5 votes
1 answer
634 views

resolution of singularities and "permissible" blow-ups.

Hi, My question seems to be closely related to that one : What strict resolutions of singularities are needed? (and it is perhaps even included in it, but I am not so sure). Let $X$ be a Gorenstein …
4 votes
2 answers
535 views

normal flatness and canonical bundle

Hi, I would like to know if there is a formula for the relative canonical bundle when performing a blow-up along an "authorized" subvariety. More precisely: Let $X$ be a projective, irreducible, nor …