Provable Pi-1-2 Singletons
逻辑
2008-02-03 v1
摘要
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.
引用
@article{arxiv.math/9302201,
title = {Provable Pi-1-2 Singletons},
author = {Sy D. Friedman},
journal= {arXiv preprint arXiv:math/9302201},
year = {2008}
}