Alasdair Urquhart

Alasdair Urquhart

Alasdair Ian Fenton Urquhart, born December 20, 1945, is Professor of Philosophy at the University of Toronto. He has made notable contributions to the field of logic, especially non-classical logic. One of his most notable achievements is proving the undecidability of the relevance logic R.

A native of Great Britain, Urquhart received his Ph.D. from the University of Pittsburgh in 1973 under the supervision of Alan Ross Anderson and Nuel Belnap.

Selected publications

* "The Undecidability of Entailment and Relevant Implication." "Journal of Symbolic Logic" 49(4): 1059-1073 (1984).


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