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Results tagged with stacks
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user 4164
In mathematics a stack or 2-sheaf is a sheaf that takes values in categories rather than sets.
5
votes
Twisted curves, admissible covers, and an algebraic analogue of a specific monodromy computa...
What naturally associates to each ramification point (or more generally, irreducible divisor in the ramification locus) is a pair $(H,\psi)$ where $H$ is a cyclic subgroup of $G$ (with $\ge 2$ element …
- 976
6
votes
Proving that a map is a morphism
Emerton has already answered, but let me summarize all the steps:
1) to a perfect torsion complex in the derived category associate a Cartier divisor;
2) to every sequence of morphisms $C\to X\to S$ …
- 976