theorem
  for a,b being Element of D*+^+<0> holds a [*] b = a^b
proof
  let a,b be Element of D*+^+<0>;
  the multMagma of D*+^+<0> = D*+^ by Def22;
  then reconsider p = a, q = b as Element of D*+^;
  thus a [*] b = p [*] q by Th18
    .= a^b by Def34;
end;
