1. Theaetetus If this is so then he would have been born when theaetetus of athens was Theaetetus took part in the battle between Athens and Corinth in 369 BC. http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Theaetetus.html

Theaetetus of Athens Born: about 417 BC in Athens, Greece Died: about 369 BC in Athens, Greece Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Version for printing Most of what we know of Theaetetus 's life comes from the writing of Plato . It is clear that Plato held Theaetetus in the highest regard and he wrote two dialogues which had Theaetetus as the principal character, one of the dialogues being Theaetetus while the other is the Sophist In Theaetetus a discussion between Socrates , Theaetetus and his teacher Theodorus of Cyrene is recorded. This conversation took place in 399 BC and Theaetetus is described as a youth at the time. This allows us to give a fairly accurate date for Theaetetus's birth (although some have claimed that the Greek word could describe a man of up to 21 years old). Again from Plato we learn that Theaetetus's father, Euphronius of Sunium, was a wealthy man and left a large fortune. However, the money was squandered by the trustees of the will but despite this Theaetetus was generous to all around him. In appearance Theaetetus had a snub nose and protruding eyes but he is described by Plato as having a beautiful mind and he is also described as being the perfect gentleman.

2. History Of Mathematics Greece Plato (427347) theaetetus of athens (c. 415-c. 369) Leodamas of Thasos (c. 380) Leon (fl. c. 375) Eudoxus of Cnidos (c. 400-c. 347) http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

3. Search Results For Plato Theaetetus, of Heraclea in Pontus, philosopher and pupil of Plato. If this is sothen he would have been born when theaetetus of athens was teaching in http://www-groups.dcs.st-and.ac.uk/~history/Search/historysearch.cgi?SUGGESTION=

4. History Of Mathematics Chronology Of Mathematicians Plato (427347) *SB *MT theaetetus of athens (c. 415-c. 369) *MT Leodamas of Thasos (fl. c. 380) *SB Leon (fl. c. 375) *SB http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

5. Theaetetus theaetetus of athens http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

6. Theaetatus theaetetus of athens Ca. 415 BCE to 369 BCE. Theaetetus was one of the great mathematicians to work in Athens during the time of Plato. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

7. PSIgate - Physical Sciences Information Gateway Search/Browse Results theaetetus of athens Born about 417 BC in Athens, Greece Died about 369 BC inAthens, Greece Show birthplace location Previous (Chronologically) Next http://www.psigate.ac.uk/roads/cgi-bin/search_webcatalogue2.pl?limit=100&term1=b

8. Biography-center - Letter T theaetetus of athens, wwwhistory.mcs.st-and.ac.uk/~history/M. .. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

9. History Of Mathematics: Greece 347); Plato (427347); theaetetus of athens (c. 415-c. 369); Leodamas of Thasos (c.380); Leon (fl. c. 375); Eudoxus of Cnidos (c. 400-c. http://aleph0.clarku.edu/~djoyce/mathhist/greece.html

Greece Cities Abdera: Democritus Alexandria : Apollonius, Aristarchus, Diophantus, Eratosthenes, Euclid , Hypatia, Hypsicles, Heron, Menelaus, Pappus, Ptolemy, Theon Amisus: Dionysodorus Antinopolis: Serenus Apameia: Posidonius Athens: Aristotle, Plato, Ptolemy, Socrates, Theaetetus Byzantium (Constantinople): Philon, Proclus Chalcedon: Proclus, Xenocrates Chalcis: Iamblichus Chios: Hippocrates, Oenopides Clazomenae: Anaxagoras Cnidus: Eudoxus Croton: Philolaus, Pythagoras Cyrene: Eratosthenes, Nicoteles, Synesius, Theodorus Cyzicus: Callippus Elea: Parmenides, Zeno Elis: Hippias Gerasa: Nichmachus Larissa: Dominus Miletus: Anaximander, Anaximenes, Isidorus, Thales Nicaea: Hipparchus, Sporus, Theodosius Paros: Thymaridas Perga: Apollonius Pergamum: Apollonius Rhodes: Eudemus, Geminus, Posidonius Rome: Boethius Samos: Aristarchus, Conon, Pythagoras Smyrna: Theon Stagira: Aristotle Syene: Eratosthenes Syracuse: Archimedes Tarentum: Archytas, Pythagoras Thasos: Leodamas Tyre: Marinus, Porphyrius Mathematicians Thales of Miletus (c. 630-c 550)

10. The Internet Classics Archive Theaetetus By Plato Where then? Euc. As I was going down to the harbour, I met Theaetetushe was being carried up to Athens from the army at Corinth. Terp. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

11. History Of Mathematics: Chronology Of Mathematicians 347) *SB *MT; Plato (427347) *SB *MT; theaetetus of athens (c. 415-c. 369) *MT;Leodamas of Thasos (fl. c. 380) *SB; Leon (fl. c. http://aleph0.clarku.edu/~djoyce/mathhist/chronology.html

Chronological List of Mathematicians Note: there are also a chronological lists of mathematical works and mathematics for China , and chronological lists of mathematicians for the Arabic sphere Europe Greece India , and Japan Table of Contents 1700 B.C.E. 100 B.C.E. 1 C.E. To return to this table of contents from below, just click on the years that appear in the headers. Footnotes (*MT, *MT, *RB, *W, *SB) are explained below List of Mathematicians 1700 B.C.E. Ahmes (c. 1650 B.C.E.) *MT 700 B.C.E. Baudhayana (c. 700) 600 B.C.E. Thales of Miletus (c. 630-c 550) *MT Apastamba (c. 600) Anaximander of Miletus (c. 610-c. 547) *SB Pythagoras of Samos (c. 570-c. 490) *SB *MT Anaximenes of Miletus (fl. 546) *SB Cleostratus of Tenedos (c. 520) 500 B.C.E. Katyayana (c. 500) Nabu-rimanni (c. 490) Kidinu (c. 480) Anaxagoras of Clazomenae (c. 500-c. 428) *SB *MT Zeno of Elea (c. 490-c. 430) *MT Antiphon of Rhamnos (the Sophist) (c. 480-411) *SB *MT Oenopides of Chios (c. 450?) *SB Leucippus (c. 450) *SB *MT Hippocrates of Chios (fl. c. 440) *SB Meton (c. 430) *SB

12. TMTh THEAETHETUS OF ATHENS of Cyrene, friend of Plato and member of his Academy, Theaetetus was wounded at the Battle of Corinth and died on his return to Athens. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

13. Theaetetus Encyclop Dia Britannica Theaetetus Etext of this work by the ancient Greek philosopher, Plato. theaetetus of athens University of St. Andrews, Scotland Short http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

14. Chapter 16 Archimedes In Plato's own time, the two greatest were theaetetus of athens and Eudoxus of Cnidus. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

15. History Of Geometry theaetetus of athens (417369 BC) was a student of Plato's, and the creator of solid geometry. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

16. Chapter 16: Archimedes In Plato s own time, the two greatest were theaetetus of athens and Eudoxus ofCnidus. And at the Lyceum, and at the Academy after Plato, many more worked http://www.anselm.edu/homepage/dbanach/arch.htm

Selections from Julia E. Diggins, String, Straightedge, and Shadow Viking Press, New York , 1965. (Illustrations by Corydon Bell) 16. A ROYAL ROAD, AFTER ALL During the 4th century B.C., Greek geometry burst its bonds and went on to the tremendous discoveries of the "age of giants." And Greek culture, too, burst from the mainland of Hellas and spread to most of the eastern Mediterranean. Both developments were connected with the romantic figure of Alexander the Great. After Plato's time, teachers and alumni from the Academy had gone on to found schools of their own. In particular, Plato's most famous associate, the great philosopher Aristotle, had set up the Lyceum in Athens, and started the systematic classification of human knowledge. And Aristotle's most renowned pupil was the warrior king Alexander of Macedon, who tried to conquer the world. In thirteen years, Alexander extended his rule over Greece proper, and Ionia, Phoenicia, Egypt, and the vast Persian domains as far as India. Then he died, and his empire broke up. But throughout those far-flung lands, he had founded Greek cities and planted the seeds of Greek civilization-the Greek language, Greek art, and, of course, Greek mathematics. Mathematicians traveled with his armies. And there is even a

17. History Of Geometry theaetetus of athens (417369 BC) was a student of Plato s, and the creator ofsolid geometry. He was the first to study the octahedron and the icosahedron, http://geometryalgorithms.com/history.htm

History Home Overview [History] Algorithms Books Web Sites Gift Shop A Short History of Geometry Ancient This is a short outline of geometry's history, exemplified by major geometers responsible for it's evolution. Click on a person's picture or name for an expanded biography at the excellent: History of Mathematics Archive (Univ of St Andrews, Scotland) Also, Click the following links for recommended: Books about Geometry History Web Sites about Geometry History Greek Medieval ... Ancient Geometry (30000 BC - 500 BC) Babylon (4000 BC - 500 BC) Egypt (5000 BC - 500 BC) The geometry of Babylon (in Mesopotamia) and Egypt was mostly experimentally derived rules used by the engineers of those civilizations. They knew how to compute areas, and even knew the "Pythagorian Theorem" 1000 years before the Greeks (see: Pythagoras's theorem in Babylonian mathematics ). But there is no evidence that they logically deduced geometric facts from basic principles. Nevertheless, they established the framework that inspired Greek geometry. A detailed analysis of Egyptian mathematics is given in the book: Mathematics in the Time of the Pharaohs . One of the few surviving documents was written by: Ahmes 1680-1620 BC) wrote the Rhind Papyrus (aka the Ahmes Papyrus). In it, he claims to not be the author, but merely a scribe of material from an earlier work of about 2000 BC. It contains rules for division, and has 87 problems including the solution of equations, progressions, volumes of granaries, etc.

18. Selected Entries From The Oxford Dictionary Of Philosophy The Parmenides and Theaetetus are late middle or early late dialogues, and theformer Speusippus, Eudoxus, Xenocrates, and theaetetus of athens. http://www.philosophy.uncc.edu/mleldrid/intro/odop.html

updated 1/8/2005 selected entries from The Oxford Dictionary of Philosophy Simon Blackburn Note: Blackburn ’s dictionary is a highly recommended reference book for philosophy students. philosophy (Gk., love of knowledge or wisdom) The study of the most general and abstract features of the world and categories with which we think: mind, matter, reason, proof, truth, etc. In philosophy, the concepts with which we approach the world themselves become the topic of enquiry. A philosophy of a discipline such as history, physics, or law seeks not so much so solve historical, physical, or legal questions, as to study the concepts that structure such thinking, and to lay bare their foundations and presuppositions. In this sense philosophy is what happens when a practice becomes self-conscious. . . . Thales of Miletus (flourished 585 BC) – One of the Seven Sages of ancient Greece and judged by Aristotle to be the founder of physical science; that is, he was the first Greek to search for the ultimate substance of things, which he identified with water. A polymath, he is supposed to have predicted the solar eclipse of 28 May 585 BC and to have introduced the study of geometry to Greece. He apparently believed in some kind of hylozoism and panpsychism, but claims made in late antiquity about his doctrines and discoveries are regarded as unreliable. Anaximander of Miletus (c. 610-c. 547/6 BC) – The first Greek philosopher and astronomer whose thought is known in any detail. Anaximander constructed the first precise geometrical model of the universe, and produced maps of both the earth and the heavens. His intentions included the

19. From Ken.Pledger@vuw.ac.nz (Ken Pledger) Newsgroups Sci.math theaetetus of athens, a student of Theodorus, may have had a lot to do withproving that sqrt(n) is irrational whenever the natural number n is not a http://www.math.niu.edu/~rusin/known-math/98/sqrt_irrat

From: Ken.Pledger@vuw.ac.nz (Ken Pledger) Newsgroups: sci.math Subject: Irrationals (was Re: please don't laugh...) Date: Wed, 09 Dec 1998 15:05:55 +1200 In article Newsgroups: sci.math Subject: Re: how to prove: if x is not a perfect square, sqr (x) is irrational, x positive integer Date: Sat, 12 Dec 1998 23:12:34 -0500 On Sat, 12 Dec 1998, TS wrote: :Date: Sat, 12 Dec 1998 20:40:37 GMT :From: TS

20. Talk:Euclid's Elements - Wikipedia, The Free Encyclopedia it had been demonstrated decades earlier by theaetetus of athens. (The currentWiki page on Theaetetus is just a stubbish entry on Plato s dialogue with http://en.wikipedia.org/wiki/Talk:Euclid's_Elements

Wikimedia needs your help in the final days of its fund drive. See our fundraising page The Red Cross and other charities also need your help. Talk:Euclid's Elements From Wikipedia, the free encyclopedia. Okay, so who thinks this should redirect to Euclid ? Can we have a show of hands, please? Actually, I think it might be nice to concentrate on Euclid's life in his article, even though we don't know much about it. I think this story this page manages to talk about it for a few paragraphs before getting to the mathematical details, so it could work. Then we could put the actual maths in this article. What do you think? Oliver P. 00:21 15 Jun 2003 (UTC) I've expanded the material on this page quite a bit. Looking at the material in the entry on "Euclid," most of it seems to be duplicated here. Unless we can find some more significant biographical information (are other sources than MacTutor available?), I agree that the articles should be merged. JPB 06:16 6 Jul 2003 (UTC) Well, this article could go through the books one by one, and summarise what is proven in each one. That would quite nice for this article, but would be a bit overwhelming if put into in the article on Euclid himself, which concentrates more on the overall significance of his work.

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