Robert Kilwardby’s Science of Logic

A Thirteenth-Century Intensional Logic


Paul Thom’s book presents Kilwardby’s science of logic as a body of demonstrative knowledge about inferences and their validity, about the semantics of non-modal and modal propositions, and about the logic of genus and species. This science is thoroughly intensional. It grounds the logic of inference on that in virtue of which the inference holds. It bases the truth conditions of propositions on relations between conceptual entities. It explains the logic of genus and species through the notion of essence.
Thom interprets this science as a formal logic of intensions with its own proof theory and semantics. This comprehensive reconstruction of Kilwardby’s logic shows the medieval master to be one of the most interesting logicians of the thirteenth century.

E-Book List price

EUR €121.00USD $146.00

Biographical Note

Paul Thom, B.Phil. (Oxford), is Honorary Professor of Philosophy at the University of Sydney and a Fellow of the Australian Academy of Humanities. He has authored numerous books on the history of logic.


Anyone interested in the history of medieval logic, anyone interested in Kilwardby’s thought, and anyone interested in ways to develop intensional logics.

Index Card