4 links
Open Problems for Undergraduates
dimacs.rutgers.edu
A collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community.
Past Open Problems
math.uiuc.edu
From the SIAM Activity Group Newsletter in Discrete Mathematics. In PostScript. Compiled by Douglas B. West.
Problems in Graph Theory and Combinatorics
math.uiuc.edu
A collection maintained by Douglas B. West, of the University of Illinois. Features brief introductions, along with references cited. Topics include matching and independence, con…
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