23 lines
485 B
Text
23 lines
485 B
Text
import data.nat
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open algebra
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example (a b c : Prop) : a → b → c → a ∧ b ∧ c :=
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begin
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intro Ha, intro Hb, intro Hc,
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apply and.intro Ha,
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apply and.intro Hb Hc
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end
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example (a b c : Prop) : a → b → c → a ∧ b ∧ c :=
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by intro Ha; intro Hb; intro Hc; apply and.intro Ha; apply and.intro Hb Hc
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open nat
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example (a b c : nat) : a = b → b = 0 + c → a = c + 0:=
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begin
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intro ab, intro bc,
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change a = c,
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rewrite zero_add at bc,
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rewrite -bc,
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exact ab
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end
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