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whatUseek Directory Site Listings:
(USA) Texas A and M University  Combinatorics/Number Theory Directory.
Algebraic Combinatorics Via Finite Group Actions  HTML book by A. Betten, H. Fripertinger, and A. Kerber.
Amazing Mathematical Object Factory  Background information and generators for several basic combinatorial objects, with an educational slant.
Applied mathematics, University of Zagreb  Research in finite combinatorial structures.
ArXiv Front: CO Combinatorics  Combinatorics section of the mathematics eprint arXiv.
British Combinatorial Committee  The British Combinatorial Committee is a body which works for the support of combinatorial and discrete mathematics in the United Kingdom.
CADCOM  Committee for the Advancement of Discrete and Combinatorial Mathematics.
CATS: Combinatorial Algorithms Test Sets  To facilitate experimental research by standardizing common benchmarks, providing a mechanism for their evolution, and making them easily accessible and usable; and identifying significant open questions in the design of good test sets and the assessment of performance of existing algorithms. To facilitate algorithm selection for applications by characterizing subproblems and the behavior of competitive algorithms on these subproblems. To encourage the development of highquality implementations of advanced algorithms and data structures.
Catalan numbers  Enumeration of the Binary Trees
Centre for Discrete Mathematics and Computing  The University of Queensland
Centre for Discrete Mathematics and Theoretical Computer Science  Research areas include artificial intelligence, combinatorial optimization, computability and complexity, and constructive algorithmics.
Centre for Discrete and Applicable Mathematics  London School of Economics
Com2MaC  Combinatorial and Computational Mathematics Centre, Pohang University of Science and Technology, Korea.
Combinatorial Mathematics Society of Australasia  To facilitate, encourage, foster and cherish combinatorics throughout Australia, New Zealand and neighbouring countries.
Combinatorics Problems  Combinatorics problems selected from math olympiads.
Combinatorics Research Group, The Open University  Graph theory, design theory, history of combinatorics, combinatorial computing.
CombinatoricsGothenburgSweden  The combinatorics group at Chalmers University of Technology and Gothenburg University, Sweden.
Combinatorists of New England  Information about meetings of the society.
DONET  Discrete Optimization: Theory and Applications  an EU TMR network
Design Resources  Links to webbased resources for design theory and related parts of discrete mathematics and statistics (coding theory, finite geometry, combinatorics, graph theory), including an annotated list of lecture notes.
