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Problems in Graph Theory and Combinatorics - http://www.math.uiuc.edu/~west/openp/
A collection maintained by Douglas B. West, of the University of Illinois. Features brief introductions, along with references cited. Topics include matching and independence, connectivity, graph homomorphism and circular coloring. |
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Open Problems for Undergraduates - http://dimacs.rutgers.edu/~hochberg/undopen/
A collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community. |
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Some Problems in Matroid Theory - http://www.math.binghamton.edu/zaslav/Matroids/matroidprobs.html
Thomas Zaslavsky of Binghamton State University of New York presents brief descriptions and references. Find information on Bonin's Projective Bound including the maximum r-flat, covering and packing by flats. |
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Past Open Problems - http://www.math.uiuc.edu/~west/pcol/pcolink.html
From the SIAM Activity Group Newsletter in Discrete Mathematics. In PostScript. Compiled by Douglas B. West. |
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Open Problems in Combinatorics - http://www.combinatorics.net/problems/
Features links to newsletters, workshops, and papers. |