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theorem proved term proof

costCompose_assoc_defect

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formal statement (Lean)

 126theorem costCompose_assoc_defect (a b c : ℝ) :
 127    (a ★ b) ★ c = a ★ (b ★ c) + 2 * (a - c) := by

proof body

Term-mode proof.

 128  unfold costCompose
 129  ring_nf
 130
 131/-- The raw `★`-operation is flexible. -/

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depends on (5)

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