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Commit 2021-06-08 19:13 75c81dee

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feat(measure_theory/integration): a measurable function is a series of simple functions (#7764)

Estimated changes

Modified src/measure_theory/integration.lean

added def measure_theory.simple_func.eapprox_diff

added theorem measure_theory.simple_func.eapprox_lt_top

added theorem measure_theory.simple_func.sum_eapprox_diff

added theorem measure_theory.simple_func.tsum_eapprox_diff