Graph colouring remains a central topic in graph theory, providing the mathematical framework for assigning colours to the elements of a graph under specific constraints. In particular, the colouring ...

If you use ODS to generate a drill-down graph, you can use style sheets to control some of the page attributes, but you are limited to the layouts that ODS offers. Although you can use a frame to ...

A theorem for coloring a large class of “perfect” mathematical networks could ease the way for a long-sought general coloring proof. Four years ago, the mathematician Maria Chudnovsky faced an all-too ...