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Hippias of Elis, fl. 5th century BC. Ancient Greek Sophist thinker and contemporary of Socrates, whom Plato portrays speaking with him in two dialogues. In the history of geometry, he is remembered for his effort to square the circle using a curve called the quadratrix. His teachings are known only by second or third hand.

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Links:

Hippias Brief article on this early Sophist, from the Internet Encyclopedia of Philosophy. www.utm.edu/research/iep/h/hippias.htm

Hippias of Elis Concise scholarly biography of this discoverer of the quadratrix, from the MacTutor History of Mathematics. www-groups.dcs.st-and.ac.uk/../Mathematicians/Hippias.html

Hippias Wikipedia entry on this ancient polymath, including some material from the 1911 Britannica. www.wikipedia.org/wiki/Hippias

Hippias Biography Constructed from excerpts from various of Plato's dialogues which mention this Sophist. www.cnu.edu/academics/phil/carr/HippiBio.htm

Hippias's Quadratrix Some brief notes on Hippias' attempt to square the circle using this curve, "a pictorial representation of the irrationality of pi." www.perseus.tufts.edu/GreekScience/Students/Tim/Quadratrix.html