- 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.
- 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.
- 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.
- Open Problems in Combinatorics - http://www.combinatorics.net/problems/
- Features links to newsletters, workshops, and papers.
- Combinatorics Problems - http://www.geocities.com/collegepark/lounge/5284/math/combinatorics.html
- Combinatorics problems selected from math olympiads.
- 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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