theorem
  for L be unital non empty multMagma
  for x be Element of L holds (power L).(x,2) = x*x
proof
  let L be unital non empty multMagma;
  let x be Element of L;
  1+1 = 2;
  hence (power L).(x,2) = (power L).(x,1) * x by Def7
    .= x * x by Th49;
end;
