A friendly iteration forcing that the four cardinal characteristics of $\mathcal E$ can be pairwise different
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DOI: 10.4064/cm8917-2-2023
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,… read more here.
Keywords: friendly iteration; cardinal characteristics; pairwise different; iteration forcing ... See more keywords