`BookProof.ChapterPvmMeasure.Pvm.norm_sq_nonneg` (E : Set X) (u : H) : 0 ≤ ‖P.p E u‖ ^ 2

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`BookProof.ChapterPvmMeasure.Pvm.norm_sq_nonneg` (E : Set X) (u : H) : 0 ≤ ‖P.p E u‖ ^ 2 · Prove2Me