theorem
  1_minus(Zmf(C1,C2)) = Umf(C1,C2) & 1_minus(Umf(C1,C2)) = Zmf(C1,C2)
proof
A1: Umf(C1,C2) = UMF [:C1,C2:];
  Zmf(C1,C2) = EMF [:C1,C2:];
  hence thesis by A1,FUZZY_1:40;
end;
