Completely nonmeasurable unions
Logic
2010-03-05 v1
Abstract
Assume that there is no quasi-measurable cardinal smaller than . ( is quasi measurable if there exists -additive ideal of subsets of such that the Boolean algebra satisfies c.c.c.) We show that for a c.c.c. -ideal I with a Borel base of subsets of an uncountable Polish space, if is a point-finite family of subsets from I then there is an uncountable collection of pairwise disjoint subfamilies of whose union is completely nonmeasurable i.e. its intersection with every non-small Borel set does not belong to the -field generated by Borel sets and the ideal I. This result is a generalization of Four Poles Theorem.
Cite
@article{arxiv.1003.0918,
title = {Completely nonmeasurable unions},
author = {Robert Ralowski and Szymon Zeberski},
journal= {arXiv preprint arXiv:1003.0918},
year = {2010}
}
Comments
6 pages