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fix(library/standard/data/list/basic): remove 'sorry'

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2014-08-01 09:15:30 -07:00
parent b2c2d1dd44
commit f75beb8087
1 changed files with 0 additions and 2 deletions
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library/standard/data/list/basic.lean
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@ -222,8 +222,6 @@ list_induction_on s
theorem mem_concat (x : T) (s t : list T) : x ∈ s ++ t ↔ x ∈ s ∨ x ∈ t
:= iff_intro (mem_concat_imp_or _ _ _) (mem_or_imp_concat _ _ _)
axiom sorry {P : Prop} : P
theorem mem_split (x : T) (l : list T) : x ∈ l → ∃s t : list T, l = s ++ (x :: t) :=
list_induction_on l
(take H : x ∈ nil, false_elim _ (iff_elim_left (mem_nil x) H))