Prof. P.T. Johnstone


Prof. P.T. Johnstone     Title: Professor of the Foundations of Mathematics

College: St John's College

Email: P.T.Johnstone@dpmms

Room: C1.07

Tel: +44 1223 3 37985

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Research Interests: I have been involved in the development of elementary topos theory since its infancy in the early 1970s, and have written two books on the subject: "Topos Theory" (Academic Press, 1977) and "Sketches of an Elephant: a Topos Theory Compendium" (Oxford U.P., 2002). My interests focus particularly on the way in which topos theory provides a means of integrating geometric and logical ideas in the foundations of mathematics and of theoretical computer science.