William of Ockham, 1285-1347. Scholastic thinker best known for his doctrine that "entities should not be unnecessarily multiplied" (Ockham's Razor). An enthusiastic Aristotelian, logician, and defender of Franciscan doctrine, he was excommunicated in 1328 by Pope John XXII.
Ockham and Infallibility
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An article by John Kilcullen, published in The Journal of Religious History in 1991. Examines Ockham's view of indefectibility of the Church and of papal infallibility.
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Ockham on Universals
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Transcript of a lecture on the problem of universals and Ockham's answer.