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Theon of Alexandria : ウィキペディア英語版
Theon of Alexandria

Theon of Alexandria (;  335 – c. 405) was a Greekscholar and mathematician who lived in Alexandria, Egypt. He edited and arranged Euclid's ''Elements'' and wrote commentaries on works by Euclid and Ptolemy. His daughter Hypatia also won fame as a mathematician.
== Life ==
Little is known about the life of Theon. He made predictions and observances of solar and lunar eclipses in 364 which show he was active at that time, and he is said to have lived during the reign of Theodosius I (379–395). The biographical tradition of the tenth century Byzantine ''Suda'' defines Theon as "the man from the Mouseion";〔Suda, (Theon θ205 )〕 however, both the Library of Alexandria and the original Mouseion were probably destroyed by the fourth century, although there may have been a new Mouseion established on a different site.〔Edward Jay Watts, (2008), ''City and School in Late Antique Athens and Alexandria'', page 150. University of California Press〕
A lunar crater, Theon Junior, now bears Theon's name.

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