Preface: Volume 13

This volume collects the extended abstracts of the 29 contributions that have been selected for presentation at the 2nd Cologne Twente Workshop on Graphs and Combinatorial Optimization logne Twente Workshop on graphs and combinatorial optimization is organized biennially at the Department of Mathematics of the University of Cologne and at the Department of Applied Mathematics of the University of Twente.There are no “main speakers”, and young researchers are particularly encouraged to discuss their work on algorithmic as well as structural aspects of graphs and combinatorial optimization problems. As this volume demonstrates, research in this area is vivid and active. cal organizers thank the members of the program committee stel (Hamburg) fioli (Milan) etril (Prague) rijver (Amsterdam) o (Grenoble) t (Odense) eir help in setting up such an attractive program. rmore, We gratefully acknowledge the financial support from Centre for Telematics and Information Technology (CTIT), the NWO (the Netherlands Organisation for Scientific Research), and the University of Twente. itional special volume of Discrete Applied Mathematics devoted to the 2nd Cologne Twente Workshop will be prepared. This volume will contain full-length versions of presentations at and results of the workshop as well as other contributions related to the topics of the workshop. Details can be obtained from the local organizers and the webpage http://www.math.utwente.nl/~ctw/Enschede, April 2003