`BookProof.ChapterMeasureAtomicDiffuse.mem_atomSet_iff` (x : α) : x ∈ atomSet mu ↔ mu {x} ≠ 0

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`BookProof.ChapterMeasureAtomicDiffuse.mem_atomSet_iff` (x : α) : x ∈ atomSet mu ↔ mu {x} ≠ 0 · Prove2Me