William of Ockham (1287-1347) is oft considered the most important nominalist thinker of the Middle Ages. Nominalism, a metaphysical view that has had adherents throughout the history of Western philosophy, largely denies the extramental existence of universals and abstract objects by reducing them to linguistic or mental items. Philosopher Claude Panaccio views Ockham's genre of nominalism as consisting of three theses: that there are no universals...