Abstract
We show that there is a boolean algebra that has the Freese-Nation property (FN) but not the strong Freese-Nation property (SFN), thus answering a question of Heindorf and Shapiro. Along the way, we produce some new characterizations of the FN and SFN in terms of sequences of elementary submodels.
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Milovich, D. On the Strong Freese-Nation Property. Order 34, 91–111 (2017). https://doi.org/10.1007/s11083-016-9389-9
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DOI: https://doi.org/10.1007/s11083-016-9389-9