Meredith graph
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In the mathematical field of graph theory, the Meredith graph is a 4-regular undirected graph with 70 vertices and 140 edges discovered by Guy H. J. Meredith in 1973.[1]
The Meredith graph is 4-vertex-connected and 4-edge-connected, has chromatic number 3, chromatic index 5, radius 7, diameter 8, girth 4 and is non-hamiltonian.[2]
Published in 1973, it provides a counterexample to the Crispin Nash-Williams conjecture that every 4-regular 4-vertex-connected graph is Hamiltonian.[3][4] However, W. T. Tutte showed that all 4-connected planar graphs are hamiltonian.[5]
The characteristic polynomial of the Meredith graph is 
.
Gallery
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Meredith graph 3COL.svg
The chromatic number of the Meredith graph is 3.
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Meredith graph 5color edge.svg
The chromatic index of the Meredith graph is 5.
References
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<references />, or <references group="..." />- ↑ Weisstein, Eric W., "Meredith graph", MathWorld.
- ↑ Bondy, J. A. and Murty, U. S. R. "Graph Theory". Springer, p. 470, 2007.
- ↑ Meredith, G. H. J. "Regular 4-Valent 4-Connected Nonhamiltonian Non-4-Edge-Colorable Graphs." J. Combin. Th. B 14, 55-60, 1973.
- ↑ Bondy, J. A. and Murty, U. S. R. "Graph Theory with Applications". New York: North Holland, p. 239, 1976.
- ↑ Tutte, W.T., ed., Recent Progress in Combinatorics. Academic Press, New York, 1969.
