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`BookProof.ChapterResidualStream.norm_residual_sub_le` {f : E → E} {L : ℝ} (hf : ∀ x y, ‖f x - f y‖ ≤ L * ‖x - y‖) (x y : E) : ‖residual f x - residual f y‖ ≤ (1 + L) * ‖x... · Prove2Me