The PFA(S)[S] conjecture on first-countable perfect pre-images of ω1\omega_1

From papers

Let XX be a first-countable perfect pre-image of ω1\omega_1, and let PFA(S)[S]\mathrm{PFA}(S)[S] denote the stated forcing axiom and its associated extension.

PFA(S)[S] conjecture. Under PFA(S)[S]\mathrm{PFA}(S)[S], every first-countable perfect pre-image of ω1\omega_1 includes a copy of ω1\omega_1.

The conjecture would sharpen the paper's consistency results involving hereditary normality by allowing “copy of ω1\omega_1” to replace “perfect pre-image of ω1\omega_1.” The source also mentions an unpublished theorem of the author related to this claim, but the supplied text gives no resolution of the conjecture.

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Sources & referencesView supporting material

Primary source

Franklin D. Tall, “PFA(S)[S] and Locally Compact Normal Spaces”, arXiv:1104.3471 (2011).

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