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chore(library/init/data/list/lemmas): ._ ==> _

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Leonardo de Moura 2017-11-13 21:50:25 -08:00
parent 2c8a901df9
commit 445cd8f0ae
1 changed files with 3 additions and 3 deletions
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6
library/init/data/list/lemmas.lean
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@ -205,9 +205,9 @@ inductive sublist : list α → list α → Prop
infix ` <+ `:50 := sublist
lemma length_le_of_sublist : ∀ {l₁ l₂ : list α}, l₁ <+ l₂ → length l₁ ≤ length l₂
| ._ ._ sublist.slnil := le_refl 0
| ._ ._ (sublist.cons l₁ l₂ a s) := le_succ_of_le (length_le_of_sublist s)
| ._ ._ (sublist.cons2 l₁ l₂ a s) := succ_le_succ (length_le_of_sublist s)
| _ _ sublist.slnil := le_refl 0
| _ _ (sublist.cons l₁ l₂ a s) := le_succ_of_le (length_le_of_sublist s)
| _ _ (sublist.cons2 l₁ l₂ a s) := succ_le_succ (length_le_of_sublist s)
/- filter -/
@[simp] theorem filter_nil (p : α → Prop) [h : decidable_pred p] : filter p [] = [] := rfl