Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-02-24 12:56 79887c96

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feat(measure_theory/group/prod): generalize topological groups to measurable groups (#11933)

  • This fixes the gap in [Halmos] that I mentioned in measure_theory.group.prod
  • Thanks to @sgouezel for giving me the proof to fill that gap.
  • A text proof to fill the gap is here

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