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reduction mod p

For $K = {\mathbf{Q}}$ and $V \in {\mathsf{Sch}}_{/ {\operatorname{Spec}{\mathbf{Z}}}} $, reduction $\operatorname{mod}p$ is pulling back:

Link to Diagram

This works for almost all $p$ and corresponds to reducing the coefficients $\operatorname{mod}p$.