proposition: Lemma eval_predI a p q z0 f : eval a p (um_filter q f) z0 = eval a (predI p q) f z0.
proof: Proof. by rewrite !eval_oevUmfilt -!umfilt_predI. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)