The Workshop on Semigroups and Languages took place in November 2002
at Center of Algebra of the University of Lisbon. It aimed at bringing together
researchers in both areas to find out about recent results of common
Jorge Almeida (University of Porto, Portugal), John Fountain (University
of York, U.K.), John Howie (University of St. Andrews, U.K.), Donald
McAlister (Northern Illinois University, U.S.A.), Douglas Munn (University
of Glasgow, U.K.), Jean-Eric Pin (University Paris 7, France), Stephen
Pride (University of Glasgow, U.K.), Nikola RuSkuc (University of St. Andrews,
U.K.), and Mikhail Volkov (Ural State University, Russia) were the
main speakers. Other researchers presented short talks.
These proceedings include part of the material given in various lectures
and some of the papers presented here are extended versions of the respective
This workshop was highly successful: about 57 people from 10 different
countries attended it. Masters and Ph.D. students who participated in the
meeting found it very useful especially because the lectures were presented
in a clear and self-contained way. This is the kind of meeting the organizers
hope to hold again in the future due to the importance of the interaction
of these two research areas.
We would like to thank all the sponsors of this workshop, namely the
Center of Algebra of the University of Lisbon, the Faculty of Sciences of
the University of Lisbon, the Luso-American Foundation for Development
and the Portuguese Foundation for Science and Technology.
Thanks are also due to the city government of Lisbon who kindly organized
a reception at, and a visit to, the Museum of the City of Lisbon. The
tile whose picture is on the cover of this book is property of this museum.