Cardinal functions on hyperspaces
Takemi Mizokami (1979)
Colloquium Mathematicae
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Takemi Mizokami (1979)
Colloquium Mathematicae
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H. B. Potoczny (1984)
Matematički Vesnik
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Jin Yuan Zhou (1993)
Commentationes Mathematicae Universitatis Carolinae
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It is proved that, under the Martin’s Axiom, every -space with countable tightness is a subspace of some pseudo-radial space. We also give several characterizations of subspaces of pseudo-radial spaces and conclude that being a subspace of a pseudo-radial space is a local property.
Aleksander V. Arhangel'skii, Romano Isler, Gino Tironi (1986)
Commentationes Mathematicae Universitatis Carolinae
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Angelo Bella (1986)
Commentationes Mathematicae Universitatis Carolinae
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