Jisho

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Wikipedia definition
1. Mathematical Treatise in Nine SectionsThe Mathematical Treatise in Nine Sections is a mathematical text written by Chinese Southern Song dynasty mathematician Qin Jiushao in the year 1247. This book contains nine chapters: Da Yan type; Heaven phenomena Area of land and field Surveying Taxation Storage of grains Building construction Military matters Price and interest. Each chapter contains nine problems, a total of 81 problems.
Read “Mathematical Treatise in Nine Sections” on English Wikipedia
Read “数書九章” on Japanese Wikipedia
Read “Mathematical Treatise in Nine Sections” on DBpedia

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