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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`. -/

depends on (4)

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