13 lines
355 B
Text
13 lines
355 B
Text
open tactic nat
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example (a b c : Prop) : a → b → ¬ a → c :=
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by do intros, contradiction
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example (a b c : Prop) : a → false → b → c :=
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by do intros, contradiction
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example (a b : nat) : succ a = zero → b = 0 :=
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by do intro `H, contradiction
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example (a b : nat) : succ a = succ b → succ a = zero → b = 0 :=
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by do intros, contradiction
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