Coskey–Farah conjecture on trivial homeomorphisms of Čech–Stone remainders

Let XX and YY be second countable, locally compact, noncompact spaces. Write X=βXXX^*=\beta X\setminus X and Y=βYYY^*=\beta Y\setminus Y, where βX\beta X and βY\beta Y are their Čech–Stone compactifications. A homeomorphism between these remainders is trivial when it is induced outside compact subsets by a homeomorphism between the underlying spaces. Coskey–Farah conjecture. CH\mathrm{CH} implies that, whenever XX^* and YY^* are homeomorphic, there are nontrivial homeomorphisms between them, while PFA\mathrm{PFA} implies that all homeomorphisms between XX^* and YY^* are trivial. This conjecture extends the corresponding question about automorphisms of P(N)/Fin\mathcal P(\mathbb N)/\operatorname{Fin} and connects set-theoretic axioms with the structure of abelian corona algebras; its resolution is not supplied here.

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Primary source

Alessandro Vignati, “Rigidity Conjectures”, arXiv:1812.01306 (2021).

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