7 lines
184 B
Text
7 lines
184 B
Text
axiom f {α : Type} : List α → List α
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theorem t (a : α) (as : List α) : f (a :: as) = as :=
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sorry
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theorem tt {a : α} {as : List α} : f (a :: as) = as :=
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by simp [t _ as]
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