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  1. On the relationship between mutual and tight stationarity.William Chen-Mertens & Itay Neeman - 2021 - Annals of Pure and Applied Logic:102963.
    We construct a model where every increasing ω-sequence of regular cardinals carries a mutually stationary sequence which is not tightly stationary, and show that this property is preserved under a class of Prikry-type forcings. Along the way, we give examples in the Cohen and Prikry models of ω-sequences of regular cardinals for which there is a non-tightly stationary sequence of stationary subsets consisting of cofinality ω_1 ordinals, and show that such stationary sequences are mutually stationary in the presence of interleaved (...)
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  • On Singular Stationarity II (Tight Stationarity and Extenders-Based Methods).Omer Ben-Neria - 2019 - Journal of Symbolic Logic 84 (1):320-342.
    We study the notion of tightly stationary sets which was introduced by Foreman and Magidor in [8]. We obtain two consistency results showing that certain sequences of regular cardinals${\langle {\kappa _n}\rangle _{n < \omega }}$can have the property that in some generic extension, every ground-model sequence of fixed-cofinality stationary sets${S_n} \subseteq {\kappa _n}$is tightly stationary. The results are obtained using variations of the short-extenders forcing method.
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