Controlling cardinal characteristics without adding reals
Logic
2021-05-18 v2
Abstract
We investigate the behavior of cardinal characteristics of the reals under extensions that do not add new -sequences (for some regular ). As an application, we show that consistently the following cardinal characteristics can be different: The ("independent") characteristics in Cicho\'n's diagram, plus . (So we get thirteen different values, including and continuum). We also give constructions to alternatively separate other MA-numbers (instead of ), namely: MA for -Knaster from MA for -Knaster; and MA for the union of all -Knaster forcings from MA for precaliber.
Cite
@article{arxiv.2006.09826,
title = {Controlling cardinal characteristics without adding reals},
author = {Martin Goldstern and Jakob Kellner and Diego A. Mejía and Saharon Shelah},
journal= {arXiv preprint arXiv:2006.09826},
year = {2021}
}
Comments
This is a variant of arXiv:1904.02617 which does not require large cardinals, as it it based on arXiv:1906.06608 instead of arXiv:1708.03691