Web Directory

» Graph Coloring Problems
   Archive for the book "Graph Coloring Problems" by Tommy R. Jensen and Bjarne Toft (Wiley Interscience 1995), dedicated to Paul Erdös. Gives progress and new problems.
   http://www.imada.sdu.dk/Research/Graphcol/

» Graph Theory Open Problems
   Six problems suitable for undergraduate research projects.
   http://dimacs.rutgers.edu/~hochberg/undopen/graphtheory/graphtheory.html

» Open Problems in Graph Algorithms
   Compiled by Jerry Spinrad.
   http://www.vuse.vanderbilt.edu/~spin/open.html

» Past Open Problems Columns
   By Douglas B. West, from the SIAM Activity Group Newsletter in Discrete Mathematics.
   http://www.math.uiuc.edu/~west/pcol/pcolink.html

» Perfect Graphs
   Conjectures and open problems, maintained at the AIM.
   http://www.aimath.org/WWN/perfectgraph/

» Perfect Problems
   Unsolved problems on perfect graphs.
   http://www.cs.concordia.ca/~chvatal/perfect/problems.html

» Problems in Graph Theory
   Maintained by Peter Cameron.
   http://www.maths.qmw.ac.uk/~pjc/oldprob.html

» Problems in Signed, Gain, and Biased Graphs
   Compiled by Thomas Zaslavsky.
   http://www.math.binghamton.edu/zaslav/Bsg/sgbgprobs.html

» Problems in Topological Graph Theory
   Web text by Dan Archdeacon with a list of open questions in topological graph theory.
   http://www.emba.uvm.edu/~archdeac/newlist/problems.html

» Some Open Problems
   Open problems and conjectures concerning the determination of properties of families of graphs.
   http://www.eecs.umich.edu/~qstout/constantques.html

» Three for the Money: The Degree/Diameter Problem
   Students can understand and work on an unsolved problem in mathematics.
   http://www.c3.lanl.gov/mega-math/workbk/graph/grthree.html

» Unsolved Problems
   Including the list of 50 problems of Bondy and Murty with current status. Compiled by Stephen C. Locke.
   http://www.math.fau.edu/locke/unsolved.htm