2015-11-26 07:45:08 +00:00
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constant f : nat → nat → nat
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definition lemma1 [forward] {a b : nat} : f a b = a :=
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sorry
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print lemma1
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definition lemma2 [forward] {a b : nat} : f a b = f b a :=
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sorry
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2015-11-26 19:41:56 +00:00
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definition lemma3 {a b : nat} : (:f a b:) = f b a :=
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2015-11-26 07:45:08 +00:00
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sorry
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print lemma2
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print lemma3
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definition lemma4 [forward] {a b c : nat} : f a b = f a c :=
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sorry
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print lemma4
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