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Fill that the Lebesgue boolean algebra is a sigma-algebra - #696

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Chessing234:feat/lebesgue-is-sigma-algebra
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Fill that the Lebesgue boolean algebra is a sigma-algebra#696
Chessing234 wants to merge 1 commit into
teorth:mainfrom
Chessing234:feat/lebesgue-is-sigma-algebra

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@Chessing234

@Chessing234 Chessing234 commented Sep 7, 2026

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Summary

  • Countable unions of Lebesgue measurable sets are Lebesgue measurable, which is the remaining sigma-algebra axiom on the Lebesgue example.

Test plan

  • lake build Analysis.MeasureTheory.Section_1_4_2; CI covers the module.

Countable unions of Lebesgue measurable sets are Lebesgue measurable, which is the remaining axiom.
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