15 lines
355 B
Text
15 lines
355 B
Text
exit
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import data.nat
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open nat
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constant C : nat → Type₁
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constant f : ∀ n, C n → C n
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constant g : ∀ n, C n → C n → C n
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lemma gffax [forward] (n : nat) (a b : C n) : (: g n (f n a) (f n b) :) = a :=
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sorry
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set_option blast.strategy "ematch"
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example (n m : nat) (a c : C n) (b : C m) : n = m → a == f m b → g n a (f n c) == b :=
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by blast
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