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Prove continuous composition preserves unsigned measurability - #725
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Fill Exercise 1.3.3(vi). A continuous function preserving nonnegativity sends an unsigned measurable function to an unsigned measurable function. Use the existing open-preimage characterization and retain the explicit nonnegativity hypothesis.
Validation:
lake build Analysis.MeasureTheory.Section_1_3_2passes on this branch. Statements are unchanged, and no new proof placeholders or axioms are introduced. The repository still contains pre-existing admitted lemmas.