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A product forcing model in which the Russell-nontypical sets satisfy ZFC strictly between HOD and the universe

Authors :
Kanovei, Vladimir
Lyubetsky, Vassily
Publication Year :
2021

Abstract

A set is nontypical in the Russell sense, if it belongs to a countable ordinal definable set. The class HNT of all hereditarily nontypical sets satisfies all axioms of ZF and the double inclusion HOD $\subseteq$ HNT $\subseteq$ V holds. Solving a problem recently proposed by Tzouvaras, a generic extension L$[a,x]$ of L, by two reals $a,x$, is presented in which L=HOD $\subsetneqq$ L$[a]$=HNT $\subsetneqq$ V=L$[a,x]$, so that HNT is a model of ZFC strictly between HOD and the universe.<br />Comment: arXiv admin note: substantial text overlap with arXiv:2111.07654

Subjects

Subjects :
Mathematics - Logic
03E35, 03E15

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2111.13491
Document Type :
Working Paper