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Fill Lebesgue and Jordan boolean-algebra constructors - #687

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Chessing234:feat/lebesgue-jordan-boolean-algebra
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Fill Lebesgue and Jordan boolean-algebra constructors#687
Chessing234 wants to merge 1 commit into
teorth:mainfrom
Chessing234:feat/lebesgue-jordan-boolean-algebra

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Summary

  • Lebesgue: empty, complement, union from Section 1.2.
  • Jordan: empty set is measurable; complement swaps the two disjuncts. Union left sorry (needs mixed Jordan / co-Jordan cases).

Test plan

  • lake build Analysis.MeasureTheory.Section_1_4_1

Made with Cursor

Empty, complement and finite union are already lemmas in §1.2; Jordan complement is Or.symm.
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