Peter Orlik Volkmar Welker Algebraic Combinatorics Lectures at a Summer School in Nordfjordeid, Norway, June 2003 ABC Authors Peter Orlik Volkmar Welker Department of Mathematics University of Wisconsin-Madison 480 Lincoln Drive Madison, Wisconsin 53706 USA E-mail:
[email protected] Philipps-Universität Marburg Fachbereich Mathematik und Informatik Hans Meerwein Strasse, Lahnberge 35032 Marburg, Germany E-mail:
[email protected] Editor Gunnar Fløystad Department of Mathematics University of Bergen Johs.Brunsgate 12 5008 Bergen, Norway E-mail:
[email protected] Mathematics Subject Classification (2000): 13D02, 32S22, 52C35; 05E99, 55N25, 55U15 Library of Congress Control Number: 2006938280 ISBN-10 3-540-68375-5 Springer Berlin Heidelberg New York ISBN-13 978-3-540-68375-9 Springer Berlin Heidelberg New York This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of t