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Given a family of curves, when does there exist a fibered surface over Spec Z parametrizing ...

Let $X_p$ be a projective curve over the finite field $\mathbf{F}_p$ (i.e. a projective $\mathbf{F}_p$-scheme pure of dimension 1) for every prime number $p$. Let $X_\mathbf{Q}$ be a projective curve …
Ariyan Javanpeykar's user avatar