`BookProof.ChapterResidualStream.norm_iterate_residual_sub_le` {f : E → E} {C : ℝ} (hf : ∀ x, ‖f x‖ ≤ C) (n : ℕ) (x : E) : ‖(residual f)^[n] x

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`BookProof.ChapterResidualStream.norm_iterate_residual_sub_le` {f : E → E} {C : ℝ} (hf : ∀ x, ‖f x‖ ≤ C) (n : ℕ) (x : E) : ‖(residual f)^[n] x - x‖ ≤ n * C · Prove2Me