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COMBINATORICA PACKAGE SYMBOL

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FranklinGraph

returns a 12-vertex graph that represents a 6-chromatic map on the Klein bottle. It is the sole counterexample to Heawood's map-coloring conjecture.

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To use , you first need to load the Combinatorica Package using .

ChromaticNumber FiniteGraphs

Combinatorica

Built-in Graphs

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