Esakia status of Spec(C(βN))
Ascertain whether the prime spectrum Spec(C(βN)) of the ring of real-valued continuous functions on the Stone–Čech compactification βN of the natural numbers is an Esakia space.
References
In particular, we do not know whether Spec(C(3IN)) is Esakia.
— Pseudocomplementation in rings of continuous functions
(2603.28165 - Bezhanishvili et al., 30 Mar 2026) in Section 5.11, Open problem paragraph (immediately before References)