Alexander Chichigin gabriel-fallen
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| #print List | |
| /- | |
| inductive List A where | |
| | nil : List A | |
| | cons : A -> List A -> List A | |
| -/ | |
| /- |
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| -- Addition | |
| theorem add_comm : ∀ (n m : Int), n + m = m + n := by | |
| intro n m | |
| simp [HAdd.hAdd, Add.add] | |
| match n, m with | |
| | Int.ofNat m, Int.ofNat n => | |
| simp [Int.add] | |
| apply Nat.add_comm |
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