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Laurence R. Horn is Professor and Director of Graduate Studies in the Yale University Department of Linguistics. His publications include" A Natural History of Negation" (1989/2001) and numerous articles addressing the union (if not the intersection) of lexical semantics, negation, and neo-Gricean approaches to meaning in natural language. He is currently working on a new book," Lexical Pragmatics," Gregory Ward is Professor of Linguistics at Northwestern University. His extensive publications