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

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open but not affine subscheme?example? [closed]

In the book algebraice geometry by R.Harshorne we always say :an open affine subset U=SpecA of a sheme X. I was always wondering that whether there existed an open but not affine subset. I want to ha …
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