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`BookProof.NavierStokesFlow.HermiteFarisLavine.tsum_shift_le` {f : ℕ → ℝ} (hf : Summable f) (hnn : ∀ n, 0 ≤ f n) : (∑' n, f (n + 2)) ≤ ∑' n, f n · Prove2Me