theorem
proved
term proof
J_symmetric
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formal statement (Lean)
27theorem J_symmetric {x : ℝ} (_hx : x ≠ 0) : J x = J (x⁻¹) := by
proof body
Term-mode proof.
28 simp only [J, inv_inv]; ring
29
30/-- J-symmetry in ratio form: J(a/b) = J(b/a). -/