Open Problems for Undergraduates (Popularity: ): A collection of open problems in Discrete Mathematics which are currently being researched by members ... Past Open Problems (Popularity: ): From the SIAM Activity Group Newsletter in Discrete Mathematics. In PostScript. Compiled by Douglas B. ... Some Problems in Matroid Theory (Popularity: ): Thomas Zaslavsky of Binghamton State University of New York presents brief descriptions and references. Find ... Open Problems in Combinatorics (Popularity: ): Features links to newsletters, workshops, and papers. Problems in Graph Theory and Combinatorics (Popularity: ): A collection maintained by Douglas B. West, of the University of Illinois. Features brief introductions, ... Problem Collection in Combinatorial Optimization (Popularity: ): Maintained by the EGRES group. HTML/LaTeX/text format.