
theorem Th97:
  for G1, G2 being _Graph, F being non empty one-to-one PGraphMapping of G1, G2
  for W2 being F-valued Walk of G2, v,w being object
  holds W2 is_Walk_from v,w implies F"W2 is_Walk_from F"_V.v, F"_V.w
  by GLIB_010:132;
