Example image of eyePlorer eyePlorer map for 'Hadwiger conjecture (graph theory)': Connectivity (graph theory) Disjoint sets Glossary of graph theory Graph (mathematics) Graph coloring Graph theory Complete graph Four color theorem Hugo Hadwiger Minor (graph theory) Contraposition Edge contraction Complete coloring Forbidden graph characterization Robertson–Seymour theorem Bipartite graph Cycle (graph theory) Series-parallel graph Planar graph Klaus Wagner (mathematician) Clique-sum Möbius ladder Fulkerson Prize Independent set (graph theory) NP-complete Parameterized complexity Homeomorphism (graph theory) Dense graph Cubic graph Edge coloring Petersen graph Snark (graph theory) W. T. Tutte Hadwiger conjecture (combinatorial geometry) Robin Thomas (mathematician) Paul Seymour (mathematician) American Institute of Mathematics Albertson conjecture Neil Robertson (mathematician) Combinatorica Unsolved problems in mathematics Hadwiger conjecture