reserve UA for Universal_Algebra,
  f, g for Function of UA, UA;
reserve I for set,
  A, B, C for ManySortedSet of I;
reserve S for non void non empty ManySortedSign,
  U1, U2 for non-empty MSAlgebra over S;

theorem
  for x, y be Element of MSAAutGroup U1 for f, g be Element of MSAAut U1
  st x = f & y = g holds x * y = g ** f by Def6;
