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

0 votes
1 answer
393 views

about formal schemes

I'm studying algebraic geometry alone. I am a 'Baby'. I need your help! On p.199 of Hartshorne's "Algebraic Geometry", what does Ex9.2 tell me?? I even can't prove it. I want to know the proof or …
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1 vote
2 answers
567 views

global sections of some sheaves

Let $Y$ be a connected, nonsingular, positive dimensional subvariety of $\mathbb{P}^n_k$ over an algebraically closed field $k$, and let $\mathcal{I}$ be the ideal sheaf of $Y$. Why are the following …
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