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Results tagged with sheaf-theory
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user 461
For questions about sheaves on a topological space.
11
votes
2
answers
656
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Equivalence of the definitions of a sheaf in SGA4 and in "Categories and Sheaves"
I asked this question on Mathematics Stack Exchange, but got no answer.
I don't understand why the definition of a sheaf (Definition 17.3.1 (ii)) given in the book
[KS] Categories and Sheaves by Kashi …
- 4,416
4
votes
Why are (pre)sheaves defined as contravariant functors? Why not just reverse the arrows in t...
In this post a presheaf is by definition a contravariant functor from a given category to the category of sets. (See Definition 1.2 in Préfaisceaux by Grothendieck and Verdier.)
If we have to choose …
- 4,416