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Completely nonmeasurable unions
Authors:Robert Rałowski  Szymon Żeberski
Institution:1.Institute of Mathematics and Computer Science,Wroc?aw University of Technology,Wroc?aw,Poland
Abstract:Assume that no cardinal κ < 2 ω is quasi-measurable (κ is quasi-measurable if there exists a κ-additive ideal $ \mathbb{I} $ \mathbb{I} of X contains uncountably many pairwise disjoint subfamilies $ \mathbb{I} $ \mathbb{I} -Bernstein unions ∪ $ \mathbb{I} $ \mathbb{I} -Bernstein if A and X \ A meet each Borel $ \mathbb{I} $ \mathbb{I} -positive subset BX). This result is a generalization of the Four Poles Theorem (see 1]) and results from 2] and 4].
Keywords:
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