proposition: Lemma umPtUE (k : K) (v : V) f : (k \\-> v \+ f == Unit) = false.
proof: Proof. by apply: (introF idP)=>/eqP/join0E/proj1/eqP; rewrite umPt0E. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)