Alasdair Ian Fenton Urquhart (born 20 December 1945) is a Scottish philosopher and emeritus Professor of Philosophy at the University of Toronto. He has made contributions to the field of logic, especially non-classical logic. One of his ideas is proving the undecidability of the relevance logic R. He also published papers in theoretical computer science venues, mostly on mathematical logic topics of relevance to computer science.
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1945 (age 80)
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