`BookProof.ChapterAttentionOutputVariance.sum_dist_sq_eq` {p : Fin m → ℝ} (hp : ∑ j, p j = 1) (v : Fin m → E) (c : E) : ∑ j, p j * ‖v j - c‖ ^ 2 = outputVariance p v + ‖observableE

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`BookProof.ChapterAttentionOutputVariance.sum_dist_sq_eq` {p : Fin m → ℝ} (hp : ∑ j, p j = 1) (v : Fin m → E) (c : E) : ∑ j, p j * ‖v j - c‖ ^ 2 = outputVariance p v + ‖observableE · Prove2Me