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When are Borel functions Baire functions?

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Fosgerau M.

Fundamenta Mathematicae

1993

tom 143

nr 2

137-152

The following two theorems give the flavour of what will be proved. Theorem. Let Y be a complete metric space. Then the families of first Baire class functions and of first Borel class functions from [0,1] to Y coincide if and only if Y is connected and locally connected.} Theorem. Let Y be a separable metric space. Then the families of second Baire class functions and of second Borel class functions from [0,1] to Y coincide if and only if for all finite sequences $U_1,...,U_q$ of nonempty open subsets of Y there exists a continuous function ϕ:[0,1] → Y such that $ ϕ^{-1}(U_i) ≠Ø$ for all i ≤ q.

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1 Fundamenta Mathematicae

1 Fosgerau M.

1 1993

Wyniki wyszukiwania

When are Borel functions Baire functions?