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Open Problems: Research-level open problems in Combinatorics. Math Combinatorics Open Problems:  Graph Theory: Problems English Science Math Research: Open Problems Problem Collection in Combinatorial OptimizationScience: Problem, Combinatorics Open Problems Maintained by the EGRES group Collection in Combinatorial Optimization HTML/LaTeX/text format. Combinatorics Problems I LikeScience: Combinatorics, Combinatorics Open Problems Joshua Cooper's list of open combinatorial problems Problems I Like . Combinatorics ProblemsScience: Combinatorics, Combinatorics Open Problems Combinatorics problems selected from math olympiads Problems . Open Problems for UndergraduatesScience: Open, Combinatorics Open Problems A collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community Problems for Undergraduates . Some Problems in Matroid Theory - Open ProblemsScience: Some, Combinatorics Open Problems Compiled by Thomas Zaslavsky Problems in Matroid Theory Open Problems . Problems in Graph Theory and Combinatorics - Open ProblemsScience: Problems, Combinatorics Open Problems Collected and maintained by Douglas B in Graph Theory and Combinatorics Open Problems West. Open problems are listed along with what is known about them. Open Problems in Discrete Math - Open ProblemsScience: Open, Combinatorics Open Problems Compiled by Matt de Vos Problems in Discrete Math Open Problems . Open Problems in CombinatoricsScience: Open, Combinatorics Open Problems Part of the Combinatorics Net Problems in Combinatorics . Open Problems in Discrete Mathematics - Open ProblemsScience: Open, Combinatorics Open Problems From the SIAM DM activity group newsletter and other sources Problems in Discrete Mathematics Open Problems . Past Open ProblemsScience: Past, Combinatorics Open Problems From the SIAM Activity Group Newsletter in Discrete Mathematics Open Problems In PostScript. Compiled by Douglas B. West. Three for the Money: The Degree/Diameter Problem - Open ProblemsScience: Three, Combinatorics Open Problems · Students can understand and work on an unsolved problem in mathematics for the Money: The Degree/Diameter Problem Open Problems . Problems in Topological Graph TheoryScience: Problems, Combinatorics Open Problems · Web text by Dan Archdeacon with a list of open questions in topological graph theory in Topological Graph Theory . Unsolved Problem of the Week ArchiveScience: Unsolved, Combinatorics Open Problems · A list of unsolved problems published by MathPro Press during 1995 Problem of the Week Archive . Unsolved Mathematics Problems - Open ProblemsScience: Unsolved, Combinatorics Open Problems · Compiled by Steven Finch Mathematics Problems Open Problems Descriptions of some unsolved problems and numerous links to other collections. Amazing Mathematical Object FactoryMath Combinatorics - Generators for several basic combinatorial objects by Frank Ruskey and Scott Lausch Mathematical Object Factory . The Combinatorics NetMath Combinatorics - Maintained by Bill Chen Net . Operational Research Programming TriviaMath Combinatorics - Computer code for research algorithms in operational research and combinatorial optimization Research Programming Trivia . Extremal Combinatorics - Open ProblemsMath Combinatorics - With Applications in Computer Science by Stasys Jukna Combinatorics Open Problems . Enumeration of the Binary Trees - Open ProblemsMath Combinatorics - A note on Catalan numbers by Ivan Galkin of the Binary Trees Open Problems . | |||||||