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for questions on one dimensional algebraic varieties over any field, including questions of moduli, and questions about specific curves.

6 votes
1 answer
247 views

Are there curves of genus 2 with real multiplication by a non-maximal order?

Let us work over $\mathbb{C}$ for the moment. Assume we are given a real quadratic field $K$ with ring of integers $\mathcal{O}_K$. $\mathbf{Question:}$ Is there a smooth projective curve $C$ of gen …
3 votes
0 answers
285 views

How much information is encoded in the Jacobian-Kummer K3 surface of a curve of genus two?

Assume we work over $\mathbb{C}$. Let $S\subset \mathbb{P}^3$ be a quartic surfaces with 16 nodes (ordinary double points). Then there is a simple principally polarized abelian surface $(A,\theta)$ …