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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Theodorus of Cyrene ： ウィキペディア英語版 Theodorus of Cyrene Theodorus of Cyrene ((ギリシア語:Θεόδωρος ὁ Κυρηναῖος)) was a Greek mathematician of the 5th century BC. The only first-hand accounts of him that survive are in three of Plato's dialogues: the ''Theaetetus'', the ''Sophist'', and the ''Statesman''. In the former dialogue, he posits a mathematical theorem now known as the Spiral of Theodorus. ==Life== Little is known of Theodorus' biography beyond what can be inferred from Plato's dialogues. He was born in the northern African colony of Cyrene, and apparently taught both there and in Athens.〔Nails, Debra. ''The People of Plato: A Prosopography of Plato and Other Socratics''. Indianapolis: Hackett Publishing, 2002, pp. 281-2.〕 He complains of old age in the ''Theaetetus'', whose dramatic date of 399 BC suggests his period of flourishing to have occurred in the mid-5th century. The text also associates him with the sophist Protagoras, with whom he claims to have studied before turning to geometry.〔c.f. Plato, ''Theaetetus'', 189a〕 A dubious tradition repeated among ancient biographers like Diogenes Laërtius〔Diogenes Laërtius 3.6〕 held that Plato later studied with him at Cyrene, Libya.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Theodorus of Cyrene」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.