for G1 being _Graph
for G2 being DLGraphComplement of G1
for v1 being Vertex of G1
for v2 being Vertex of G2 st v1 = v2 & v1 is isolated holds
( v2 .inNeighbors() = the_Vertices_of G2 & v2 .outNeighbors() = the_Vertices_of G2 & v2 .allNeighbors() = the_Vertices_of G2 )