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`BookProof.ChapterAttentionOutputVariance.outputVariance_eq_zero_iff_of_pos` {p : Fin m → ℝ} (hp0 : ∀ j, 0 < p j) (v : Fin m → E) : outputVariance p v = 0 ↔ ∀ j, v j = observableEx · Prove2Me