feat(MeasureTheory): prove the TFAE characterizations of Jordan measurability - #666
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Chessing234 wants to merge 3 commits into
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feat(MeasureTheory): prove the TFAE characterizations of Jordan measurability#666Chessing234 wants to merge 3 commits into
Chessing234 wants to merge 3 commits into
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…rability Exercise 1.1.5: inner=outer iff elementary sandwich iff small outer symmetric difference. Boolean closure already uses this TFAE, so filling it removes a sorry from those proofs.
Set.symmDiff_subset_union is a membership lemma here, not a subset, so the 3→1 direction of the TFAE failed to typecheck.
simp already closed the identity, so tauto had nothing left to do.
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Summary
JordanMeasurable.equiv.out 0 1, so filling this sorry also completes those proofs.IsElementary.isBoundedso the 3→1 direction can use that.Local
lake buildwas not possible here (disk); CI is the compiler check.Test plan
buildgreenMade with Cursor