Open Problems in Combinatorics

Combinatorial Problems I Like, by Josh Cooper Open Problems - Graph Theory and Combinatorics, by Douglas B. West Open problems in combinatorics (pdf file) , by Alexander Postnikov Positivity Problems and Conjectures in Algebraic Combinatorics, by Richard Stanley Ten Problems in Combinatorics, Lecture given by Gian-Carlo Rota at the Conference on Combinatorics and Physics (CAP'98), held at the Los Alamos National Laboratory, August 10-12, 1998. To be announced. Open Problems from the SIAM Activity Group Newsletter in Discrete Mathematics Problems on the Enumeration of Matchings (ps file) , by James Propp Unsolved Combinatorial Problems, by Zsolt Tuza Open Problems on Perfect Graphs, by Vašek Chvátal Problems in Signed, Gain, and Biased Graphs, compiled by Thomas Zaslavsky Unsolved Problems in Graph Theory, compiled by Stephen C. Locke Open Problems of Paul Erdös, by Fan R. K. Chung A list of problems on permutation groups, by Peter J. Cameron A problem on transitive permutation groups, by Peter J. Cameron Some Problems in Matroid Theory, compiled by Thomas Zaslavsky Unsolved Mathematics Problems, compiled by Steven Finch.