Jon Barwise
Kenneth Jon Barwise (; June 29, 1942 – March 5, 2000)^{[1]} was an American mathematician, philosopher and logician who proposed some fundamental revisions to the way that logic is understood and used.
Born in Independence, Missouri to Kenneth T. and Evelyn Barwise, he was a precocious child.
A pupil of Solomon Feferman at Stanford University, Barwise started his research in infinitary logic. After positions as assistant professor at the Universities of Yale and Wisconsin, during which time his interests turned to natural language, he returned to Stanford in 1983 to direct the Center for the Study of Language and Information. He began teaching at Indiana University in 1990. He was elected a Fellow of the American Academy of Arts and Sciences in 1999.^{[2]}
Barwise contended that, by being explicit about the context in which a proposition is made, the situation, many problems in the application of logic can be eliminated. He sought ... to understand meaning and inference within a general theory of information, one that takes us outside the realm of sentences and relations between sentences of any language, natural or formal. In particular, he claimed that such an approach resolved the liar paradox. He made use of Peter Aczel's nonwellfounded set theory in understanding "vicious circles" of reasoning.
Barwise, along with his former colleague at Stanford John Etchemendy, was the author of the popular logic textbook Language, Proof and Logic. Unlike the Handbook of Mathematical Logic which was a survey of the state of the art of Mathematical Logic c. 1975, and of which he was the editor, this work targeted elementary logic. The text is notable for including computeraided homework problems, some of which provide visual representations of logical problems. During his time at Stanford, he was also the first Director of the Symbolic Systems Program, an interdepartmental degree program focusing on the relationships between cognition, language, logic, and computation. The K. Jon Barwise Award for Distinguished Contributions to the Symbolic Systems Program has been given periodically since 2001.^{[3]}
Works
 Barwise, K. J. (1975) Admissible Sets and Structures. An Approach to Definability Theory ISBN 0387074511
 Barwise, K. J. & Perry, John (1983) Situations and Attitudes. Cambridge: MIT Press. ISBN 1575861933^{[4]}
 Barwise, K. J. & Etchemendy, J. (1987) The Liar: An Essay in Truth and Circularity ISBN 0195059441^{[5]}
 Barwise, K. J. (1988) The Situation in Logic ISBN 0937073326
 Barwise, K. J. & Moss, L. (1996) Vicious Circles. On the Mathematics of NonWellfounded Phenomena ISBN 1575860082^{[6]}
 Barwise, K, J. & Seligman, J. (1997) Information Flow: the Logic of Distributed Systems ISBN 0521583861
 Barwise, K. J. & Etchemendy, J. (2002) Language, Proof and Logic ISBN 157586374X
 Barwise, K. J. Editor (1977) Handbook of Mathematical Logic. xi+1165 pages ISBN 072042285X
See also
References
 ^ Walsh, Eileen (8 March 2000). "Noted logician K. Jon Barwise dies". Stanford News Service.
 ^ "Book of Members, 17802010: Chapter B" (PDF). American Academy of Arts and Sciences. Retrieved May 20, 2011.
 ^ K. Jon Barwise Award, Symbolic Systerms Program, Stanford University
 ^ Butterfield, Jerry (April 1986). by Jon Barwise and John Perry"Situations and Attitudes"Review of .
 ^ Moss, Lawrence S. (1989). by Jon Barwise and John Etchemendy"The Liar: An essay in truth and circularity"Review of (PDF). Bull. Amer. Math. Soc. (N.S.) 20 (2): 216–225.
 ^ Rutten, J. J. M. M. (1998). by Jon Barwise and Larry Moss"Vicious circles: On the mathematics of nonwellfounded phenomena"Review of (PDF). Bull. Amer. Math. Soc. (N.S.) 35 (1): 69–75.
External links
 : Kenneth Jon Barwise by Solomon FefermanIn Memoriam The Bulletin of Symbolic Logic vol. 6(4) Dec. 2000, pp505–8 (PostScript)
 K. Jon (Kenneth) Barwise at the Mathematics Genealogy Project

 1942 births
 2000 deaths
 American logicians
 Deaths from colorectal cancer
 Fellows of the American Academy of Arts and Sciences
 Indiana University faculty
 Mathematical logicians
 People from Independence, Missouri
 Stanford University alumni
 University of Wisconsin–Madison faculty
 Yale University faculty
 20thcentury mathematicians