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13 votes

Justification of the term "invertible sheaf"

Yes, for quasi-coherent sheaves on a scheme it is true that if $M \otimes N \cong \mathcal{O}_X$, then $M$ is locally free of rank one. It is enough to prove the REDUCTION Let $M,N$ be $A$- module …
Georges Elencwajg's user avatar
15 votes
Accepted

What is the right version of "partitions of unity implies vanishing sheaf cohomology"

Although we clearly all have more or less the same answers, here is how I like to organize things. I) Let $\mathcal F$ be a sheaf of abelian groups on the topological space $X$. It is said to be sof …
Georges Elencwajg's user avatar