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Fill that the restriction of a sigma-algebra is a sigma-algebra - #705

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teorth:mainfrom
Chessing234:feat/sigma-restrict-is-sigma
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Fill that the restriction of a sigma-algebra is a sigma-algebra#705
Chessing234 wants to merge 1 commit into
teorth:mainfrom
Chessing234:feat/sigma-restrict-is-sigma

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@Chessing234

@Chessing234 Chessing234 commented Sep 7, 2026

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Summary

  • A countable union in the restricted algebra is the preimage of the countable union of chosen lifts, which the original sigma-algebra contains.

Test plan

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

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