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Results tagged with stacks
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user 16751
In mathematics a stack or 2-sheaf is a sheaf that takes values in categories rather than sets.
10
votes
Divisorial contraction: when is the image an algebraic space or a stack?
In order to have a contraction morphism $X\to Y$, the intersection matrix must be negative definite.
Conversely, if the intersection matrix is negative definite, the contraction morphism exists in th …
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