cograph (367B)
1 # Cograph 2 3 https://en.wikipedia.org/wiki/Cograph 4 5 The [graph_class] of *cographs* is the [graph_class] of [undirected_graphs] defined by starting from the [single_vertex_graph] and [graph_closing] by the [graph_complementation] and [graph_disjoint_union] [graph_operations]. 6 7 Also called the P4-free graphs, cf [pk_free_graph]. 8 9 Up: [graph_family] 10 11 Aliases: cographs