
theorem Th79:
  for a, b being Ordinal, d being object st d in dom CantorNF(a(+)b) &
    omega -exponent((CantorNF(a(+)b)).d)
      in rng(omega -exponent CantorNF b) \ rng(omega -exponent CantorNF a)
  holds omega -leading_coeff((CantorNF(a(+)b)).d) =
    (omega -leading_coeff CantorNF b).(
      (omega -exponent CantorNF b)".(omega -exponent((CantorNF(a(+)b)).d)))
  by Th78;
