New answers tagged sheaf-theory
2
votes
Accepted
Are the injections of a coproduct a cover in the canonical pretopology?
This will not be the case in general. A family is a cover in the canonical topology if all its pullbacks are jointly regular epimorphism.
So this will for example be the case if coproducts are ...
- 39.3k
10
votes
Accepted
Derived category of local systems of finite type on a $K(\pi,1)$ space: an explicit counterexample
I can give an example that is even a smooth complex algebraic variety that shows up naturally in algebraic geometry.
Let $X$ be the moduli space of abelian varieties of genus $g>1$ with full level $...
- 131k
Top 50 recent answers are included