[Merged by Bors] - feat(measure_theory/constructions/polish): quotient group is a Borel space #19186
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Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr> Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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…space (#19186) * Suslin's theorem: an analytic set with analytic complement is measurable. * Image of a measurable set in a Polish space under a measurable map is an analytic set. * Preimage of a set under a measurable surjective map from a Polish space is measurable iff the original set is measurable. * Quotient space of a Polish space with quotient σ-algebra is a Borel space provided that it has second countable topology. * In particular, quotient group of a Polish topological group is a Borel space. * Change instance for `measurable_space` on `add_circle`.
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space is measurable iff the original set is measurable.
measurable_spaceonadd_circle.