Quasi-Polish spaces and their equivalent representations are formalized in second-order arithmetic, with reverse-mathematical analysis of the transitions between them.
Notions of closed subsets of a complete separable metric space in weak subsystems of second-order arithmetic
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Quasi-Polish spaces and spaces of filters in second-order arithmetic
Quasi-Polish spaces and their equivalent representations are formalized in second-order arithmetic, with reverse-mathematical analysis of the transitions between them.