`BookProof.ChapterMeasureAtomicDiffuse.restrict_atomSet_eq_sum_dirac` [IsFiniteMeasure mu] : mu.restrict (atomSet mu) = Measure.sum (fun x : atomSet mu => mu {(x : α)} • Measure.di

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`BookProof.ChapterMeasureAtomicDiffuse.restrict_atomSet_eq_sum_dirac` [IsFiniteMeasure mu] : mu.restrict (atomSet mu) = Measure.sum (fun x : atomSet mu => mu {(x : α)} • Measure.di · Prove2Me