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In mathematics, the Federer–Morse theorem, introduced by Federer and Morse, states that if f is a surjective continuous map from a compact metric space X to a compact metric space Y, then there is a Borel subset Z of X such that f restricted to Z is a bijection from Z to Y.
Moreover, the inverse of that restriction is a Borel section of f—it is a Borel isomorphism.
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