Concept

Szekeres snark

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

Official source

https://en.wikipedia.org/wiki/Szekeres_snark

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