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Prove unsigned measurability is invariant under almost-everywhere equality - #726
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Fill Exercise 1.3.3(iv): a nonnegative function equal almost everywhere to an unsigned measurable function is measurable. Reuse the simple approximants and transfer convergence off the null exceptional set, then apply the existing almost-everywhere characterization. No boundedness hypothesis is needed.
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.