def
definition
def or abbrev
coshEnhancement
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formal statement (Lean)
59def coshEnhancement (t : ℝ) : ℝ :=
proof body
Definition body.
60 if t = 0 then 1 else 2 * (Real.cosh t - 1) / t ^ 2
61
62/-- The perturbative (quadratic) cost: t²/2. -/