theorem
proved
term proof
costFamily_unit
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formal statement (Lean)
123theorem costFamily_unit (κ : ℝ) : costFamily κ 1 = 0 := by
proof body
Term-mode proof.
124 unfold costFamily
125 simp
126
127/-- The order-preserving power map on positive reals, written paper-style as
128 `x ↦ x^α`. -/