fact: Definition union_map_classPCMMix := PCMMixin (@joinC K C V U) (@joinA K C V U) (@unitL K C V U) (@validL K C V U) (validU U).
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)