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First level Borel functions and isomorphisms. (English) Zbl 0514.54026


MSC:

54H05 Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets)
54C08 Weak and generalized continuity
03E15 Descriptive set theory
26A21 Classification of real functions; Baire classification of sets and functions
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