theorem
proved
term proof
midpointMap_fixed_point
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formal statement (Lean)
43theorem midpointMap_fixed_point : midpointMap 1 = 1 := by
proof body
Term-mode proof.
44 unfold midpointMap; norm_num
45
46/-- J decreases under the midpoint map for any x > 0, x ≠ 1. -/