proposition: Lemma rangePt x k v : C k -> x \in range (U:=U) (pts k v) = (x == v).
proof: Proof. by move=>C'; rewrite /range assocsPt C' inE. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)