- Hippasus
**Hippasus**of Metapontum ( _el. Ίππασος), b. c.500 B.C. inMagna Graecia , was a Greekphilosopher . He was a disciple ofPythagoras . To Hippasus (or Hippasos) is attributed the discovery of the existence ofirrational numbers . More specifically, he is credited with the discovery that thesquare root of 2 is irrational.Until Hippasus' discovery, the Pythagoreans preached that all numbers could be expressed as the ratio of integers. Despite the validity of his discovery, the Pythagoreans initially treated it as a kind of religious heresy and they either exiled or murdered Hippasus. Legend has it that the discovery was made at sea and that Hippasus' fellow Pythagoreans threw him overboard.

But there are two other stories about Hippasus. The first says that Hippasus was expelled from the Pythagorean school because he published doctrines of Pythagoras, while the second says that he was drowned at sea for revealing the construction of the

dodecahedron in the sphere and claiming it as his own. But since the Pythagoreans' supposed pledge to secrecy was most likely false Fact|date=May 2008, the authenticity of these stories is questioned.He was also noted as an early experimenter in

acoustics andresonance . Few of his original works now survive.**References***

Simon Singh (1997) "Fermat's Last Theorem", p. 54 ISBN 1-85702-521-0**ee also***

Incommensurable magnitudes **External links*** [

*http://scienceworld.wolfram.com/biography/Hippasus.html Hippasus of Metapontum*]

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**HIPPASUS**— Metapontinus, auditor Pythagorae, vir doctissimus nihil scripsit. Musicus quoque excellens. Theon. Smyrn. Mathem. l. 2. c. 12. Omnia ex igne creari dixit. Sunt quidam, qui eum tractatum de religione sub Pythagorae nomine edidisse ferant, ipsi… … Hofmann J. Lexicon universale**Hippasus**— Hippasos (griech. Ἵππασος, latinisiert Hippasus) ist der Name folgender Personen: Hippasos von Metapont, griechischer Mathematiker Hippasos, Sohn des Keyx, fällt bei der Eroberung der Stadt Oichalia und wird von Herakles begraben (Apollodor… … Deutsch Wikipedia**Hippasus (mythology)**— In Greek mythology, Hippasus is the name of nine characters.*Hippasus, father of Hippomedon, by the nymph Ocyrrhoe, and also of Charops, Socus, Agelaus, and Pammon. [Quintus Smyrnaeus. The Fall of Troy ,… … Wikipedia**Hippasus of Metapontum**— (6th c. BC) The member of the school of Pythagoras credited with having discovered irrational numbers. According to one legend the discovery was made during a voyage, and Hippasus was then either divinely punished by shipwreck, or perhaps thrown… … Philosophy dictionary**Hippasus de Métaponte**— Hippase de Métaponte Hippase de Métaponte (vers 460 avant J.C.) était un philosophe et mathématicien grec pythagoricien. Sommaire 1 Biographie 2 Doctrine 2.1 Cosmologie … Wikipédia en Français**Hippasus of Metapontum**— ▪ Greek philosopher flourished c. 500 BC philosopher, early follower of Pythagoras, coupled by Aristotle with Heraclitus (Heracleitus) in identifying fire as the first element in the universe. Some traditions say that he was drowned after… … Universalium**Hippasus of Metapontum**— See Greek arithmetic, geometry and harmonics … History of philosophy**Ceyx (father of Hippasus)**— Not to be confused with Ceyx, husband of Alcyone. See also Ceyx (disambiguation). In Greek mythology, Ceyx was a king of Trachis in Thessaly. He received Herakles[1], and Herakles s sons later fled to him.[2] Some accounts make him Amphitryon s… … Wikipedia**Greek arithmetic, geometry and harmonics: Thales to Plato**— Ian Mueller INTRODUCTION: PROCLUS’ HISTORY OF GEOMETRY In a famous passage in Book VII of the Republic starting at Socrates proposes to inquire about the studies (mathēmata) needed to train the young people who will become leaders of the ideal… … History of philosophy**Square root of 2**— The square root of 2, also known as Pythagoras constant, often denoted by:sqrt{2} or √2but can also be written as:2^{1/2},,is the positive real number that, when multiplied by itself, gives the number 2. Its numerical value approximated to 65… … Wikipedia