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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

5 votes

What do non-principal divisors in a Picard group look like

Here's the combinatorial picture which might be useful to your understanding. Think of a Riemann surface as a graph. The genus of a Riemann surface is the minimal number of circles you need to cut ou …
Sera Gunn's user avatar
  • 376
2 votes

On the notion of sub-hyperfield

There are two possible notions for a sub-hyperring that make sense: A subset $S$ containing zero and such that for any $x, y\in S$, $x + y \in S$ and $xy \subseteq S$. A subset $S$ such that with th …
Sera Gunn's user avatar
  • 376