2015-03-26 00:42:34 +00:00
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import data.nat
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open nat
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2015-07-07 23:37:06 +00:00
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attribute nat.add [unfold 2]
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attribute nat.rec_on [unfold 2]
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2015-03-26 00:42:34 +00:00
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example (a b c : nat) : a + 0 = 0 + a ∧ b + 0 = 0 + b :=
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begin
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apply and.intro,
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all_goals (state; rewrite zero_add)
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end
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