SACCHARINITY WITH ccc

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Authors: Haim Horowitz, Saharon Shelah
Cited by: 3
References: 21

Abstract

Abstract Using creature technology, we construct families of Suslin ccc non-sweet forcing notions Q $\mathbb Q$ double struck upper Q such that Z F C $ZFC$ upper Z upper F upper C is equiconsistent with Z F + $ZF+$ upper Z upper F plus “Every set of reals equals a Borel set modulo the ( ≤ ℵ 1 ) $(\leq \aleph _1)$ left parenthesis less than or equals normal first transfinite cardinal 1 right parenthesis -closure of the null ideal associated with Q $\mathbb Q$ double struck upper Q ” + $+$ plus “There is an ω 1 $\omega _1$ omega 1 -sequence of distinct reals.” This answers a question of the second author and Kellner. As an application of independent interest, we also show how our forcing adds a new Π 2 1 $\Pi ^1_2$ normal upper Pi 2 Superscript 1 singleton over L without relying on L

Fields of Study & Subjects

Advanced Topology and Set Theory Computability Logic AI Algorithms Rings Modules and Algebras

Publication details

Journal / source
Journal of Symbolic Logic
Publisher
Cambridge University Press (CUP)
Pages
1–23
Publication date
15 May 2026
Language
EN