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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.
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On Bourbaki's characterization of projectives...
In Bourbaki's Commutative Algebra we have the following theorem:
II.5.2 Let $A$ ba a ring and $P$ an $A$-module. TFAE:
(i) $P$ is a f.g. projective module\
(ii) $P$ is a finitely presented module a …