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Let $\mathcal{E}$ be the $\sigma$-ideal generated by the closed measure zero sets of reals. We use an ultrafilter-extendable matrix iteration of ccc posets to force that, for $\mathcal{E}$, their associated… Click to show full abstract
Let $\mathcal{E}$ be the $\sigma$-ideal generated by the closed measure zero sets of reals. We use an ultrafilter-extendable matrix iteration of ccc posets to force that, for $\mathcal{E}$, their associated cardinal characteristics (i.e.\ additivity, covering, uniformity and cofinality) are pairwise different.
Keywords:
friendly iteration;
cardinal characteristics;
pairwise different;
iteration forcing
Journal Title: Colloquium Mathematicum
Year Published: 2022
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Journal Title: Colloquium Mathematicum
Year Published: 2022
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!