Keywords: Well-covered graph.svg well-covered graph the intersection graph of the nine diagonals of a hexagon The same graph is also one of the members of the Petersen family One of its 14 maximal independent sets is shown as the set of red vertices; each maximal independent set has the same number of vertices and each corresponds to one of the 14 triangulations of the hexagon own Modified from one of the graphs in File Petersen family svg David Eppstein 2011-08-09 Cc-zero Graph theory Files by User David Eppstein from en wikipedia |