reserve G, G1, G2 for _Graph, H for Subgraph of G;

theorem Th63:
  createGraph([#]the_Vertices_of G) in G.allSpanningSG()
proof
  set H = createGraph([#]the_Vertices_of G);
  reconsider H as Subgraph of G;
  the_Vertices_of H = the_Vertices_of G;
  then H is spanning by GLIB_000:def 33;
  hence thesis by Th60;
end;
