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