fact: Variables (K V : ordType) (C : pred K) (C' : pred V) (U : union_map_class C V) (U' : union_map_class C' K).
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)