Existence of Sacks-indestructible MAD families below
Existence of Sacks-indestructible MAD families below
Let be the splitting number and the bounding number. A Sacks-indestructible MAD family is a maximal almost disjoint family that remains maximal after forcing with Sacks forcing.
Sacks-indestructibility conjecture. If
then there is a Sacks-indestructible MAD family.
This conjecture links the cardinal-invariant inequality below with preservation of maximal almost disjointness under Sacks forcing. The paper states the existence claim but does not provide a proof or resolution.
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Sources & referencesView supporting material
Primary source
Dilip Raghavan and Juris Steprāns, “On weakly tight families”, arXiv:1010.1226 (2010).
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