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theorem proved term proof

jcost_squared_form

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formal statement (Lean)

  79theorem jcost_squared_form {x : ℝ} (hx : x ≠ 0) :
  80    Jcost x = (x - 1) ^ 2 / (2 * x) := Jcost_eq_sq hx

proof body

Term-mode proof.

  81
  82/-! ## §2. Zero characterization and ratio interpretation -/
  83
  84/-- **F1.2.1**: J(v/n) = 0 ↔ v = n for v, n > 0 -/

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