23 lines
467 B
Text
23 lines
467 B
Text
import data.nat
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open algebra nat
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section
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open nat
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set_option blast.strategy "preprocess" -- make sure simplifier is not used by default
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attribute add.comm [simp]
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attribute add.assoc [simp]
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attribute add.left_comm [simp]
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example (a b c : nat) : a + b + b + c = c + b + a + b :=
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by simp
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example (a b c : nat) : a = b → a + c = c + b :=
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by simp
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definition f : nat → nat := sorry
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example (a b c : nat) : f a = f b → f a + c = c + f b :=
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by simp
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end
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