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theorem proved tactic proof

actionCost_symm

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formal statement (Lean)

  28theorem actionCost_symm (a b : ActionState) : actionCost a b = actionCost b a := by

proof body

Tactic-mode proof.

  29  by_cases h : a = b
  30  · subst h
  31    simp [actionCost]
  32  · have h' : b ≠ a := by intro hb; exact h hb.symm
  33    simp [actionCost, h, h']
  34

used by (1)

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depends on (2)

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