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Published online by Cambridge University Press: 19 September 2016
In this paper I argue that negation in The Port Royal Logic is not a failed or incoherent approximation of Boolean complementation as maintained by Sylvain Auroux and Marc Dominicy, but is rather a version of privative negation from medieval logic, and that as such it has a perfectly coherent semantics. The discussion reviews the critiques of Auroux and Dominicy as well as the semantics of privative negation as found in Aristotle, Proclus, Ockham, Buridan, Descartes, and Arnauld.