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Homotopy theory, homological algebra, algebraic treatments of manifolds.

7 votes

Classification of simply connected smooth projective varieties?

That is way too ambitious, I think, considering what is known about classification of algebraic varieties. Ignoring the trivial, for these purposes, case of curves, the next and best studied case is a …
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7 votes
Accepted

Applications of Faber's conjecture

Numerical evidence, from computing the cases $g=2,3,\dots$, eventually $g\le 15$, and seeing the symmetry in the numbers $\dim R_g^n$. I recall Carel saying he made the conjecture when $g$ was still …
VA.'s user avatar
  • 13.1k
38 votes
Accepted

Example Wanted: When Does Čech Cohomology Fail to be the same as Derived Functor Cohomology?

Q1: A very simple example is given in Grothendieck's Tohoku paper "Sur quelques points d'algebre homologique", sec. 3.8. Edit: The space is the plane, and the sheaf is constructed by using a union of …
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12 votes

What is the Euler characteristic of a Hilbert scheme of points of a singular algebraic curve?

The same formula holds for $\chi(X^{[n]})$ of any topological space for which $\chi(X)$ is defined and behaves in the expected way for unions, Cartesian products, and quotients by a finite free action …
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