Th e aim of this paper is to examine the medieval posterity of the Aristotelian and Pyrrhonian treatments of the infi nite regress argument. We show that there are some possible Pyrrhonian elements in Autrecourt's epistemology when he argues that the truth of our principles is merely hypothetical. By contrast, Buridan's criticisms of Autrecourt rely heavily on Aristotelian material. Both exemplify a use of scepticism.
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