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Concept
Watkins snark
Summary
In the mathematical field of graph theory, the Watkins snark is a snark with 50 vertices and 75 edges. It was discovered by John J. Watkins in 1989.
As a snark, the Watkins graph is a connected, bridgeless cubic graph with chromatic index equal to 4. The Watkins snark is also non-planar and non-hamiltonian. It has book thickness 3 and queue number 2.
Another well known snark on 50 vertices is the Szekeres snark, the fifth known snark, discovered by George Szekeres in 1973.
Image:Watkins snark 3COL.svg|The [[chromatic number]] of the Watkins snark is 3.
Image:Watkins snark 4edge color.svg|The [[chromatic index]] of the Watkins snark is 4.
Official source
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