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theorem proved term proof

costCompose_comm

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formal statement (Lean)

 121theorem costCompose_comm (a b : ℝ) : a ★ b = b ★ a := by

proof body

Term-mode proof.

 122  unfold costCompose; ring
 123
 124/-- **THEOREM: Associator defect for raw RCL composition.**
 125    The unnormalized RCL form is not strictly associative; the defect is `2*(a-c)`. -/

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