proposition: Lemma umfilt_morph_ax p : morph_axiom (@sepT _) (um_filter p).
proof: Proof. by rewrite /um_filter; apply: omap_morph_ax. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)