Wilson's conjecture on the first Solovay ordinal of a derived model

From papers

Let VV satisfy PFA, let \bkappa\nobreak\bkappa be a limit of Woodin cardinals, and let D(V,κ)D(V,\kappa) denote the derived model at κ\kappa. Write Θ0D(V,κ)\Theta_0^{D(V,\kappa)} for the first level of its Solovay hierarchy. Wilson's conjecture. Assume PFA and that κ\kappa is a limit of Woodin cardinals. Then

Θ0D(V,κ)<κ+\Theta_0^{D(V,\kappa)} < \kappa^+

and

Θ0D(V,κ)<ΘD(V,κ).\Theta_0^{D(V,\kappa)} < \Theta^{D(V,\kappa)}.

Wilson's original conjecture removes the countable-cofinality assumption from his earlier theorem bounding the first Solovay ordinal. The paper presents this as an open generalization; the supplied source gives no resolution.

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Sources & referencesView supporting material

Primary source

Derek Levinson and Nam Trang, “Derived Models in PFA”, arXiv:2501.05954 (2025).

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