Valuation rings of mixed characteristic as limits of complete intersection rings.
2021
We show that a mixed characteristic valuation ring with a value group $\Gamma$ and a residue field $k$ of characteristic $p>0$, is a filtered direct limit of complete intersection $\bf Z$-algebras if $\Gamma/{\bf Z}\val(p)$ has no torsion, $k$ is separably generated over $F_p$ and either $V$ is Henselian, or $\dim V=1$ .
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