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Prove addition preserves unsigned measurability - #729
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Fill Exercise 1.3.3(vii): addition preserves unsigned measurability. Add simple approximants and pass to the pointwise limit. Nonnegativity excludes negative infinity, allowing the extended-real continuity lemma for addition even when either limit is positive infinity.
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.