11 lines
222 B
Text
11 lines
222 B
Text
import data.nat
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open nat algebra
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attribute nat.add [unfold 2]
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attribute nat.rec_on [unfold 2]
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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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