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function field
See global field.
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See global field.
Filter by codimension, then obstructions to extending over higher codimension things is measured by cohomology of the Unsorted/function field :
One can ask a similar question about \(\operatorname{Cl} (K)\) for \(G\in {\mathsf{Ab}}\), or replacing \({\mathbf{Q}}\) with Unsorted/function field \({ \mathbf{F} }_q(t)\) for \(q=p^n\), and ask questions about frequency of primes ramified primes, split primes, or remaining inert primes.
valuation ring of the adic completion of a rational Unsorted/function field over \(K = { \mathbf{F} }_q\):