Real classes in the ultrapower of hereditarily finite sets
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Antonín Sochor (1975)
Commentationes Mathematicae Universitatis Carolinae
Hans Carstens (1975)
Fundamenta Mathematicae
Miroslav Benda (1974)
Fundamenta Mathematicae
J. Wierzejewski (1976)
Colloquium Mathematicae
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