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def definition def or abbrev

J

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formal statement (Lean)

  24noncomputable def J (x : ℝ) : ℝ := (x + x⁻¹) / 2 - 1

proof body

Definition body.

  25
  26/-- **J-Symmetry**: J(x) = J(1/x) for all x ≠ 0. -/

depends on (5)

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