Keywords: Identity graph1.svg en Identity graph ru Тождественный_г аф Own Hikin1987 2008 <gallery>Image Identity_graph2 svg Image Identity_graph3 svg Image Identity_graph4 svg Image Identity_graph5 svg Image Identity_graph6 svg Image Identity_graph7 svg Image Identity_graph8 svg</gallery> Undirected planar graphs Graphs with 6 vertices |