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The Four Color Theorem - http://www.math.gatech.edu/~thomas/FC/fourcolor.html
Computer aided proof of the four color theorem by Neil Robertson, Daniel P. Sanders, Paul Seymour and Robin Thomas. |
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Knight's Tour Problem - http://www.tri.org.au/knightframe.html
Solution for chess boards with up to 32 squares. |
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Parameters of Directed Strongly Regular Graphs - http://homepages.cwi.nl/~aeb/math/dsrg/dsrg.html
Parameters, constructions and nonexistence information for directed strongly regular graphs. |
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Regular Graphs Page - http://www.mathe2.uni-bayreuth.de/markus/reggraphs.html
Tables of simple connected k-regular graphs on n vertices and girth at least g. |
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The Hamiltonian Page - http://www.densis.fee.unicamp.br/~moscato/Hamilton.html
Hamiltonian cycle and path problems, their generalisations and variations. |