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Fill that countably additive measures stay countably additive on subalgebras - #715

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Fill that countably additive measures stay countably additive on subalgebras#715
Chessing234 wants to merge 1 commit into
teorth:mainfrom
Chessing234:feat/cam-restrict-alg-is-ca

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@Chessing234

@Chessing234 Chessing234 commented Sep 7, 2026

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Summary

  • Restricting a countably additive measure to a sub-sigma-algebra keeps countable additivity, since the set function is unchanged.

Test plan

  • lake build Analysis.MeasureTheory.Section_1_4_3; CI covers the module.

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