A new proof of the four color theorem by Ashay Dharwadker that uses group theory and Steiner systems.
A survey by Zsolt Tuza.
Hamiltonian cycle and path problems, their generalisations and variations.
A research network funded by the European Commission.
By Arjeh M. Cohen.
Solution for chess boards with upto 32 squares.
Generates a Traveling Salesman Problem map and data for a given set of US cities.
Notes on a semiotic approach to constructing isomorphism invariants of graphs by John-Tagore Tevet.
By Pablo Moscato.
Notes and bibliography by Keith Edwards.
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