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lemma proved term proof

phi_rpow_mono

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formal statement (Lean)

 235lemma phi_rpow_mono : Monotone (fun x : ℝ => goldenRatio ^ x) :=

proof body

Term-mode proof.

 236  phi_rpow_strictMono.monotone
 237
 238/-- Interval propagation for φ^x: if lo ≤ x ≤ hi, then φ^lo ≤ φ^x ≤ φ^hi -/

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