13 lines
229 B
Text
13 lines
229 B
Text
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import data.nat
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open algebra nat
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definition lemma1 (a b : nat) : a + b + 0 = b + a :=
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by blast
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print lemma1
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definition lemma2 (a b c : nat) : a + b + 0 + c + a + a + b = 0 + 0 + c + a + b + a + a + b :=
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by blast
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print lemma2
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