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theorem proved tactic proof

eventCost_symm

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formal statement (Lean)

  27theorem eventCost_symm (a b : EventState) : eventCost a b = eventCost b a := by

proof body

Tactic-mode proof.

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

used by (1)

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depends on (2)

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