reserve G for _Graph;
reserve G2 for _Graph, G1 for Supergraph of G2;

theorem Th79:
  for G2, G1 for W being Walk of G2 holds W is Walk of G1
proof
  let G2, G1;
  A1: G2 is Subgraph of G1 by Th61;
  let W be Walk of G2;
  thus thesis by A1, GLIB_001:167;
end;
