20 lines
424 B
Text
20 lines
424 B
Text
import data.nat
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open nat
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attribute nat.add [unfold-c 2]
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attribute nat.rec_on [unfold-c 2]
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namespace tactic
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definition then_all (t1 t2 : tactic) : tactic :=
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focus (t1 ; all_goals t2)
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infixl `;;`:15 := tactic.then_all
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end tactic
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open tactic
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example (a b c : nat) : (a + 0 = 0 + a ∧ b + 0 = 0 + b) ∧ c = c :=
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begin
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apply and.intro,
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apply and.intro ;; (esimp[of_num]; state; rewrite zero_add),
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apply rfl
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end
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