let G2 be _Graph; for v1, v2 being Vertex of G2
for e being object
for G1 being addEdge of G2,v1,e,v2 holds the_Vertices_of G1 = the_Vertices_of G2
let v1, v2 be Vertex of G2; for e being object
for G1 being addEdge of G2,v1,e,v2 holds the_Vertices_of G1 = the_Vertices_of G2
let e be object ; for G1 being addEdge of G2,v1,e,v2 holds the_Vertices_of G1 = the_Vertices_of G2
let G1 be addEdge of G2,v1,e,v2; the_Vertices_of G1 = the_Vertices_of G2