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William of Ockham

Franciscan Logician

William of Ockham

c. 1287–1347 · Ockham and Munich · European

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An English Franciscan friar and logician who held that only individual things exist and that general terms are names. His preference for simpler explanations became known as Ockham’s razor.

Key work: Summa Logicae (c. 1323)

“Plurality must never be posited without necessity.”

Commentary on the Sentences, book 1, distinction 27, question 2 (“Numquam ponenda est pluralitas sine necessitate”), as rendered in Wikipedia’s “Occam’s razor”

Key ideas, in brief (in our words)

  • Do not posit more things than you need.

  • General words are names, not things in the world.

  • Only individual things exist.

Read more: Stanford Encyclopedia of Philosophy

On the climb

Names, Not ThingsOccam’s Razor

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