Directory of Open Problems Resources

Research-level open problems in Combinatorics.

Subcategories

Open Mathematical Questions

http://www.jdawiseman.com/papers/easymath/open_questions.html
A few unsolved mathematical questions put together by Julian D. A. Wiseman.
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.
Open Problems in Combinatorics

http://www.combinatorics.net/problems/
Features links to newsletters, workshops, and papers.
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.
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.
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.

Thanks to DMOZ, which built a great web directory for nearly two decades and freely shared it with the web. About us