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`BookProof.CarlemanUnboundedHop.cutMass_nonneg` (hθ0 : ∀ r, 0 ≤ θ r) (hΘ : ∀ j, HasSum (fun i => θ (i + j + 1)) (Θ j)) (N : ℕ) : 0 ≤ cutMass u Θ N · Prove2Me