Witold Marciszewski

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2ranked-venue papers
1as first author
1since 2021 · last 2026
0000-0003-3384-5782ORCID · corroborated

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Theory of computation · 2 · 1 first-author · 1 since 2021
YearPublicationVenuePosition
2026 On Sierpiński sets, Hurewicz spaces and Hilgers functions
Witold Marciszewski, Roman Pol, Piotr Zakrzewski
Ann. Pure Appl. Log.1
2006 Universal spaces for classes of scattered Eberlein compact spaces
abstract
Abstract We discuss the existence of universal spaces (either in the sense of embeddings or continuous images) for some classes of scattered Eberlein compacta. Given a cardinal κ, we consider the class δκof all scattered Eberlein compact spaces K of weight ≤ κ and such that the second Cantor-Bendixson derivative of K is a singleton. We prove that if κ is an uncountable cardinal such that κ = 2≤κ, then there exists a space X in δκ such that every member of δκ is homeomorphic to a retract of X. We show that it is consistent that there does not exist a universal space (either by embeddings or by mappings onto) in . Assuming that = ω1, we prove that there exists a space X ∈ which is universal in the sense of embeddings. We also show that it is consistent that there exists a space X bΕ , universal in the sense of embeddings, but δω1 does not contain an universal element in the sense of mappings onto.
Murray Bell, Witold Marciszewski
J. Symb. Log.2