B-chromatic number 6 Color Coloring 6 Induced subgraphs 6 Polynomial approximation 6 Chromatic number 4 Graph G 4 Graph theory 4 Graphic methods 4 Monotonicity 4 P4-tidy graphs 4 Polynomial-time algorithms 4 b-coloring 4 b-continuity 4 b-monotonicity 4 Augmenting path 2 Bipartite graphs 2 Combinatorial optimization 2 Dynamic programming 2 Forestry 2 Mathematics 2 Polynomial-time dynamic programming 2 Proper coloring 2 Stability number 2 Trees 2 Trees (mathematics) 2 Triangle-free graphs 2