proposition: Lemma um_unitbUnPt k v f : unitb (f \+ pts k v) = false.
proof: Proof. by rewrite joinC; apply: um_unitbPtUn. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)