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Results tagged with neron-models
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user 52824
6
votes
Accepted
"Unramified" extension of DVRs and permanence of excellence
No. Let $R'$ be any non-excellent dvr whatsoever, hence of equicharacteristic $p > 0$, and let $t \in R'$ be a uniformizer. Let $R = \mathbf{F}_p[t]_{(t)}$. The local inclusion $R \hookrightarrow R'$ …