Graph theory Graphic methods Coloring Graph coloring Minimum sum coloring Trees (mathematics) Trees COLOR Color Graph colorings Line graph Line graphs of trees Polynomial approximation Set-coloring Cartesian product of graphs Cayley graphs Cographs Dynamic programming Edge intersection graphs Forbidden induced subgraphs Forestry Hom-idempotent graphs Kneser graphs P 4-sparse graphs Paths on a grid Stability number Triangle-free graphs k-tuple colorings (k (normal, Helly)