The saturated large-field conjecture for the EK\mathscr{E}_K-topology

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Let KK be a large, λ\lambda-saturated field for a sufficiently large cardinal λ\lambda. For a henselian local domain R⊆KR\subseteq K with fraction field KK, let the RR-adic topology be the topology whose basic sets are aR+baR+b with a∈K×a\in K^\times and b∈Kb\in K.

Saturated large-field conjecture. The EK\mathscr{E}_K-topology is the intersection of all RR-adic topologies as RR ranges over henselian local domains R⊆KR\subseteq K with Frac⁡(R)=K\operatorname{Frac}(R)=K. Moreover, it is a field topology if and only if there is a henselian local domain R⊆KR\subseteq K with Frac⁡(R)=K\operatorname{Frac}(R)=K such that, for every other such henselian local domain S⊆KS\subseteq K, one has aS⊆RaS\subseteq R for some a∈K×a\in K^\times.

The paper relates this claim to the description of EK\mathscr{E}_K-open sets in highly saturated large fields; its resolution is not supplied here.

References

Primary source

Erik Walsberg, “Derivations and gt-henselian field topologies”, arXiv:2509.02889 (2025).

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