theorem Th52: :: GLIB_012:52

for G1 being _Graph
for V being non empty Subset of (the_Vertices_of G1)
for G2 being inducedSubgraph of G1,V
for G3 being DLGraphComplement of G1
for G4 being inducedSubgraph of G3,V holds G4 is DLGraphComplement of G2