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A Néron-Ogg-Shafarevich criterion for K3 surfaces
The naive analogue of the Néron-Ogg-Shafarevich criterion is false for K3 surfaces, that is, there exist K3 surfaces over Henselian, discretely valued fields $K$, with unramified $\ell$-adic étale cohomology groups, but which do not admit good reduction over $K$. Assuming potential semi-stable reduc
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