Constructing \(\Delta_3^0\) using topologically restrictive countable disjoint unions

DOI10.14321/REALANALEXCH.31.2.0547zbMATH Open1108.03049OpenAlexW1583253522MaRDI QIDQ851093

Abhijit Dasgupta

Publication date: 13 November 2006

Published in: Real Analysis Exchange (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.14321/realanalexch.31.2.0547

zbMATH Keywords

Borel setsPolish spaceseparated union

Mathematics Subject Classification ID

Descriptive set theory (03E15) Classes of sets (Borel fields, (sigma)-rings, etc.), measurable sets, Suslin sets, analytic sets (28A05) Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets) (54H05)

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