Summary of the Contents: Part I: Negation in Philosophical Logic J. Michael Dunn: Generalized Ortho Negation Chrysafis Hartonas: Order-Duality, Negation and Lattice Representation Wolfgang Lenzen: Necessary Conditions for Negation Operators Ingolf Max: External, Restricted External and Internal Negations in a Two-Dimensional Logic Werner Stelzner: Negation and Relevance Part II: Negation in Linguistics Wojciech Buszkowski: Categorial Grammars with Negative Information William A. Lasusaw: Negative Concord and 'Mode of Judgement' Ton van der Wouden: Litotes and Downward Monotonicity Frans Zwarts: A Hierarchy of Negative Expressions Part III: Negation in Artificial Intelligence Gerhard Schurz: The Role of Negation in Nonmonotonic Logis and Defeasible Reasoning Gerd Wagner: Belnap's Episitemic States and Negation-as-Failure Summary of contents: 1. Negation in Philosophical Logic (with articles by J.M. Dunn, G. Falkenberg, Ch. Hartonas, W. Lenzen, I. Max, W. Stelzner) 2. Negation in Linguistics and Philosophy of Language (with articles by W. Buszkowski, H. Kamp, W. A. Ladusaz, A. Merin, T. van der Wouden, F. Zwarts) 3. Negation in Artificial Intelligence (with articles by G. Schurz, G. Wagner)