Commit 1f0a5233 authored by Ralf Jung's avatar Ralf Jung
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explain weird contractive_alt statement

parent d7ee81fd
Pipeline #3221 passed with stage
in 10 minutes and 51 seconds
......@@ -875,6 +875,7 @@ Section later.
Proper (dist n ==> dist_later n) later_car.
Proof. move=> [x] [y] /= Hxy. done. Qed.
(* f is contractive iff it can factor into `Next` and a non-expansive function. *)
Lemma contractive_alt {B : ofeT} (f : A B) :
Contractive f g : later A B,
( n, Proper (dist n ==> dist n) g) ( x, f x g (Next x)).
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