Jia Xian triangle (Pascal's triangle) using rod numerals, as depicted in a publication of Zhu Shijie
in 1303 AD.
Yang Hui referred to Jia Xian's Shi Suo Suan Shu in the Yongle Encyclopedia
Jia Xian (simplified Chinese: 贾宪; traditional Chinese: 賈憲; pinyin: Jiǎ Xiàn; Wade–Giles: Chia Hsien; ca. 1010–1070) was a Chinese mathematician from Kaifeng of the Song dynasty.
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Jia Xian additive-multiplicative square-root extraction