reserve x,y,y1,y2 for set;
reserve C for non empty set;
reserve c for Element of C;
reserve f,h,g,h1 for Membership_Func of C;

theorem Th13:
  EMF(C) c= f
proof
  let x be Element of C;
A1: rng f c= [.0,jj.] by RELAT_1:def 19;
  dom f = C & (EMF(C)).x = 0 by FUNCT_2:def 1,FUNCT_3:def 3;
  hence thesis by A1,Th12;
end;
