theorem
  Hom(C) c= V implies hom??(V,C)?-(a opp) = hom?-(V,a)
proof
  assume
A1: Hom(C) c= V;
A2: id(a opp) = id a by OPPCAT_1:71;
  thus hom??(V,C)?-(a opp)
     = (curry hom??(C)).(id a) by A1,Def26,A2
    .= hom?-(a) by Th56
    .= hom?-(V,a) by A1,Def24;
end;
