Marcin Michalski, Robert Rałowski, Szymon Żeberski
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A \(\sigma \)-ideal \(\mathcal {I}\) on a Polish group \((X,+)\) has the Smital Property if for every dense set D and a Borel \(\mathcal {I}\)-positive set B the algebraic sum \(D+B\) is a complement of a set from \(\mathcal {I}\). We consider several variants of this property and study their connections with the countable chain condition, maximality and how well they are preserved via Fubini products. In particular we show that there are \(\mathfrak {c}\) many maximal invariant \(\sigma \)-ideals with Borel bases on the Cantor space \(2^\omega \).
期刊介绍:
The journal publishes research papers and occasionally surveys or expositions on mathematical logic. Contributions are also welcomed from other related areas, such as theoretical computer science or philosophy, as long as the methods of mathematical logic play a significant role. The journal therefore addresses logicians and mathematicians, computer scientists, and philosophers who are interested in the applications of mathematical logic in their own field, as well as its interactions with other areas of research.