fact: Definition union_map_eqMix K (V : eqType) := @union_map_class_eqMix K xpredT V _ (@unionmapMixin K V).
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)