proposition: Lemma umUPtE (k : K) (v : V) f : (f \+ k \\-> v == Unit) = false.
proof: Proof. by rewrite joinC umPtUE. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)