mathlib4
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feat(MeasureTheory): generalize `ae` to `OuterMeasureClass`
- Move definition and some lemmas from
MeasureSpaceDef
toOuterMeasure.AE
. - Rename
MeasureTheory.Measure.ae
toMeasureTheory.ae
. - Generalize the definition and theorems to
[OuterMeasureClass _ _]
.
See also https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/.22Almost.20every.22.20on.20outer.20measures and https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Order.20on.20measures/near/425729507