theorem
  for f1 be PartFunc of M,COMPLEX, x be Element of M holds f1 is total &
  f2 is total implies (f1(#)f2)/.x = f1/.x * (f2/.x)
proof
  let f1 be PartFunc of M,COMPLEX;
  let x be Element of M;
  assume f1 is total & f2 is total;
  then f1(#)f2 is total by Th33;
  then dom (f1(#)f2) = M;
  hence thesis by Def1;
end;
