proposition: Lemma oev_rconsN a k ks f z0 : k \notin dom f -> oeval a (rcons ks k) f z0 = oeval a ks f z0.
proof: Proof. by rewrite oev_rconsE=>/find_none ->. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)