English

Iterating Semi-proper Forcing using Virtual Models

Logic 2023-03-23 v1

Abstract

By a virtual model, we mean a model of set theory which is elementary in its transitive closure. Virtual models are first used by Neeman \cite{neeman2014forcing} to iterate forcing. That paper is concerned with proper forcing. The method was then adjusted by Veli\v{c}kovi\'c to the case of semi-proper forcing and this was drafted in \cite{velickovic2021iteration}. We here straighten the details and further elaborate on Veli\v{c}kovi\'c's method. The first section collects facts about virtual model, the second section describes the iteration, and the third one illustrates the method in the case of getting saturation of NSω1\mathsf{NS}_{\omega_1} (loosely relying on \cite{schindler2016nsomega1}).

Keywords

Cite

@article{arxiv.2303.12565,
  title  = {Iterating Semi-proper Forcing using Virtual Models},
  author = {Obrad Kasum and Boban Veličković},
  journal= {arXiv preprint arXiv:2303.12565},
  year   = {2023}
}