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《周髀算经》公元前100年汉朝人撰,是一部既谈天体又谈数学的天文历算著作,主要讨论盖天说.《周髀》的本文是周公,商高问答部份,提出了著名的「勾三股四弦五」这个勾股定理的一个特例.接下去的荣方陈子问答部份,是《周髀》的续文,陈子教给荣方学习和研究数学的方法,并且记载了陈子测日法所用的「勾股各自乘,并而开方除之」的话.唐朝李淳风等选定数学课本时,认为它是一个最可贵的数学遗产,将它作为「算经十书」的第一种书,并给它一个《周髀算经》的名称.
“Zhou Zuo Su Jing” The Han Dynasty was written in 100 BC, is a celestial calendar about both celestial bodies and mathematics books, mainly talking about cover days. “Zhou” This article is Zhou Gong, Gao Q & A part , Put forward the famous “hook three four four string five” this Pythagorean theorem a special case.Following the Rongfang Chenzi Q & A part is the continuation of “Zhou”, Chen taught Rongfang to learn and study mathematics , As well as the “Pythagorean, respectively, multiplied by the Pythagorean,” which was used by Chen Zih-t’a-ya in examining the Japanese. The textbook selected by the Li Chun-fang from the Tang Dynasty considered it to be one of the most valuable mathematical heritages as “ Count the first book of ten books, and give it a name of ”Book of Changes".