Book 3629

In April 2004, after one year of intense debate, CMCS, the International Workshop on Coalgebraic Methods in Computer Science, and WADT, the Workshop on Al- braic Development Techniques, decided to join their forces and reputations into a new high-level biennial conference. CALCO, the Conference on Algebra and Co- gebra in Computer Science, was created to bring together researchers and practit- ners to exchange new results related to foundational aspects, and both traditional and emerging uses of algebras and coalgebras in computer science. A steering committee was put together by merging those of CMCS and WADT: Jiri Adamek, Ataru Na- gawa, Michel Bidoit, Jose Fiadeiro (co-chair), Hans-Peter Gumm, Bart Jacobs, Hans- Jorg Kreowski, Ugo Montanari, Larry Moss, Peter Mosses, Fernando Orejas, Fr- cesco Parisi-Presicce, John Power, Horst Reichel, Markus Roggenbach, Jan Rutten (co-chair), and Andrzej Tarlecki. CALCO 2005 was the first instance of this new conference. The interest that it generated in the scientific community suggests that it will not be the last.
Indeed, it attracted as many as 62 submissions covering a wide range of topics roughly divided into two areas: Algebras and Coalgebras as Mathematical Objects: Automata and languages; categorical semantics; hybrid, probabilistic, and timed systems; inductive and co- ductive methods; modal logics; relational systems and term rewriting.

Book 4409

This book constitutes the thoroughly refereed post-workshop proceedings of the 13th International Workshop on Algebraic Development Techniques, WADT'98, held in Lisbon, Portugal, in April 1998, as part of ETAPS'98.
The 21 revised full papers presented were selected during two rounds of reviewing and revision for inclusion in the book. The papers address all current issues in the area, in particular algebraic (and other) specification techniques, algebraic combination of logics, algebraic structures and logics for concurrency, other algebraic structures and their logics, specification languages and their associated methods and tools, and term rewriting and theorem proving.