âŠa Song dynasty edition of Yang Hui suanfa (1275; âYang Huiâs Mathematical Methodsâ). The latter contains three treatises, Chengchu tongbian benmo (1274; âFundament and Periphery for Continuity and Change in Multiplication and Divisionâ), Tianmu bilei chengchu jiefa (1275; âQuick Methods for Multiplication and Division in Surveying and Analogous Categoriesâ), andâŠ
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