Commit 536c3662 authored by Ralf Jung's avatar Ralf Jung

omap lemmas

parent 1a019465
......@@ -926,6 +926,23 @@ Section find.
Qed.
End find.
(** ** Properties of the [omap] function *)
Lemma list_fmap_omap {B C : Type} (f : A option B) (g : B C) (l : list A) :
g <$> omap f l = omap (λ x, g <$> (f x)) l.
Proof.
induction l as [|x y IH]; [done|]. simpl.
destruct (f x); [|done]. simpl. by f_equal.
Qed.
Lemma list_omap_ext {B C : Type} (f : A option C) (g : B option C)
(l1 : list A) (l2 : list B) :
Forall2 (λ a b, f a = g b) l1 l2
omap f l1 = omap g l2.
Proof.
induction 1 as [|x y l l' Hfg ? IH]; [done|].
simpl. rewrite Hfg. destruct (g y); [|done].
by f_equal.
Qed.
(** ** Properties of the [reverse] function *)
Lemma reverse_nil : reverse [] =@{list A} [].
Proof. done. Qed.
......
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