Peter Tennant Johnstone is Professor of the Foundations of Mathematics at the University of Cambridge, and a fellow of St. John's College. He invented or developed a broad range of fundamental ideas in topos theory. He is a great-great nephew of the Reverend George Gilfillan who was apostrophised by William McGonagall.
- — "[F]ar too hard to read, and not for the faint-hearted"
- Johnstone, Peter (1982), Stone Spaces, Cambridge University Press, ISBN 978-0-521-33779-3. – Zbl. 0499.54001
- Johnstone, Peter (1987), Notes on Logic and Set Theory, Cambridge University Press, ISBN 978-0-521-33692-5.
- Johnstone, Peter (2002–), Sketches of an Elephant: A Topos Theory Compendium. I, II, Oxford University Press, ISBN 978-0-19-852496-0. – Zbl. 1071.18002 (v.3 in preparation)
- ^ "Fellows of St. John's College 2009". Cambridge University Reporter. 2009-10-02.
- ^ An anonymous referee, as quoted by Johnstone in his Sketches of an elephant, p. ix.
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