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Abstract

In aP-space the intersection of a wellorderable family of open sets is open (andT 2 holds). The assertion that everyP-space is discrete is equivalent to Keisler's axiom that every set is almost wellorderable. In models ofZ F minus the axiom of choice compact connectedP-spaces exist.

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Brunner, N. P-Räume und auswahlaxiom. Rend. Circ. Mat. Palermo 33, 34–36 (1984). https://doi.org/10.1007/BF02844409

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  • DOI: https://doi.org/10.1007/BF02844409

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