A Closed Separable Subspace of βN Which is Not a Retract

DOI10.2307/2000518zbMATH Open0613.54004OpenAlexW4238999209MaRDI QIDQ4720377

Petr Simon

Publication date: 1987

Published in: Transactions of the American Mathematical Society (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2307/2000518

zbMATH Keywords

liftingZFCultrafilterStone-Cech compactification of countable discrete spacenonempty closed separable subspace of \(\beta \) N

Mathematics Subject Classification ID

Extensions of spaces (compactifications, supercompactifications, completions, etc.) (54D35) Retraction (54C15)

Related Items (3)

In memoriam: Petr Simon (1944--2018) ⋮ On the Borel hierarchies of countable products of Polish spaces ⋮ Title not available (Why is that?)

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