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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Literature
Blass A.,A model without ultrafilters, Bull. Acad. Polon.,25 (1977), 329–331.
Gillman L., Jerison M.,Rings of continuous functions, Springer, 1976.
Jech T. J.,Axiom of choice, North Holland, 1973.
Keisler H. H.,Model theory for infinitary logic, North Holland, 1971.
Levy A.,Axioms of multiple choice, Fund. Math.,50 (1962), 475–483.
Misra A. K.,A topological view of P-spaces, Gen. top. appl.,2 (1972), 349–362.
Soundararajan T.,Weakly Hausdorff spaces, General Topology (Novak), Academia (1971), 301–306.
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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