edited by W Gähler (Freie Universität Berlin, Germany) & G Preuss (Freie Universität Berlin, Germany)

The book collects original research papers on applied categorical structures, most of which have been presented at the North-West European Category Seminar 2003 in Berlin. The spectrum of these mathematical results reflects the varied interests of Horst Herrlich — one of the leading category theorists of the world — to whom this volume is dedicated in view of his 65th birthday. The book contains applications of categorical methods in various branches of mathematics such as algebra, analysis, logic and topology, as well as fuzzy structures and computer science. At the end of the book the reader will find a complete list of Horst Herrlich's publications.

The proceedings have been selected for coverage in:

• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)

• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)

• CC Proceedings — Engineering & Physical Sciences

• On Boole's Booleanness (B Banaschewski)
• Homeomorphically Closed Nearness Spaces (H L Bentley & J W Carlson)
• The Tensor Product of Orthomodular Posets (R Börger)
• Saturated Collections of Metrics (E Colebunders et al.)
• Topological Structures in Logics (W Gähler)
• The Structure of Affine Algebraic Sets (E Giuli)
• A Characterization of Co-Retracts of Functional Structures (R Kaschek)
• Introducing Lagois Correspondences (A Melton)
• On Coalgebras which are Algebras (H-E Porst & C Dzierzon)
• Fibrewise Sobriety (G Richter & A Vauth)
• and other papers