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William of Ockham was a Franciscan at Oxford. He came just short of receiving his theology degree; he was never able to undertake the necessary year of teaching because of the long list of those waiting and the opposition of his enemy, John Lutterel. From 1320 to 1324, he taught and wrote at the London Studium, the private school of his order. He was summoned to Avignon in 1324 on charges of heresy and became involved there in the dispute over Franciscan poverty. In 1328 Ockham fled with Michael of Cesena, general of his order, was excommunicated, and took refuge in Munich with Duke Ludwig of Bavaria, who had also been excommunicated. From there he engaged in an extensive polemic against Pope John XXII and his successors, writing numerous political works. Ockham's metaphysics and his logic are closely connected because of his deployment of "Ockham's razor," the notion that we should not suppose that more things exist than are needed to explain the meaning of true sentences. Very often his arguments hang on the logical analysis of a sentence, revealing its logical structure and making it clear that some questionable entity, something other than a word or an individual thing, is not referred to in it. His philosophy is marked by nominalism. He rejected the notion that we somehow or other get the forms of things themselves into our intellect, attacking especially Scotist attempts to hold on to this view using the "formal distinction." Instead, he held that our concepts were like mental words, with a natural capacity to signify their objects but in no way to be identified with their objects. This led to a strong skeptical current among his followers. (Bowker Author Biography)
— biography from Ockham - Philosophical Writings: A Selection
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