14 lines
380 B
Text
14 lines
380 B
Text
open list
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definition appd {A : Type} : list A → list A → list A
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| nil l := l
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| (h :: t) l := h :: (appd t l)
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theorem appd_nil {A : Type} (l : list A) : appd nil l = l :=
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rfl
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theorem appd_cons {A : Type} (h : A) (t l : list A) : appd (h :: t) l = h :: (appd t l) :=
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rfl
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example : appd ((1:nat) :: 2 :: nil) (3 :: 4 :: 5 :: nil) = (1 :: 2 :: 3 :: 4 :: 5 :: nil) :=
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rfl
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