Provable Pi-1-2 Singletons

Details Provable Pi-1-2 Singletons Provable Pi-1-2 Singletons

1993-02-04

arxiv.org/abs/math/9302201v1

Mathematics

Logic

Scientific paper

In this note I show that a pi-1-2 singleton R of L-degree strictly between 0
and 0# can be obtained so as to be the unique solution to a pi-1-2 formula
which provably has at most one solution, in the theory ZFC+(*) where (*) has
the approximate strength of an ineffable cardinal.

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