
theorem Th10:
  for G1, G2 being _Graph, F being PGraphMapping of G1,G2
  st F is Disomorphism holds G1 is Dcomplete iff G2 is Dcomplete
proof
  let G1, G2 be _Graph, F be PGraphMapping of G1,G2;
  assume A1: F is Disomorphism;
  then reconsider F0 = F as one-to-one PGraphMapping of G1, G2;
  F0" is isomorphism Dcontinuous by A1, GLIB_010:74, GLIB_010:75;
  hence G1 is Dcomplete implies G2 is Dcomplete by Th9;
  thus G2 is Dcomplete implies G1 is Dcomplete by A1, Th9;
end;
