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An abelian variety has good reduction $\iff$ the Neron model is proper
Let $R$ be a D.V.R. with the fraction field $K$, $A$ a $K$- abelian variety, $\mathfrak{A} \to \operatorname{Spec}R$ the Neron model of $A$.
We say $A$ has good reduction if there exists a smooth prop …