Zhu Shijie (Chinese: 朱世杰, Styled Hanqing 字漢卿，號松庭) ( mid-1270s?-1330?) also known as Chu Shih-Chieh was one of the greatest Chinese mathematicians. Cha can also refer to a Latin American dance, also called the Cha-cha-cha. ... The 1270s is the decade starting January 1, 1270, and ending December 31, 1279. ... Events The Bulgars under Michael III are beaten by the Serbs at Velbuzhd, and large parts of Bulgaria fall to Serbia. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Little is known about his life, but two of his mathematical works have survived. Introduction to Mathematical Studies 《算學啟蒙》, written in 1299, is an elementary textbook on mathematics. Zhu included about 260 problems to explain operations in arithmetic and algebra. This book also showed how to measure different two-dimensional shapes and three-dimensional solids. The Introduction had an important influence on the development of mathematics in Japan. The book was once lost in China until a copy of the book was made from a Korean source in 1839. Events Osman I declares the independence of the Ottoman Principality The County of Holland is annexed by the County of Hainaut April 1, 1299 Kings Towne on the River Hull granted city status by Royal Charter of King Edward I of England. ... Arithmetic or arithmetics (from the Greek word αριθμός = number) is the oldest and simplest branch of mathematics, used by almost everyone, for tasks ranging from simple daily counting to advanced science and business calculations. ... Algebra is a branch of mathematics concerning the study of structure, relation and quantity. ... 1839 was a common year starting on Tuesday (see link for calendar). ...

Zhu's second book, Precious Mirror of the Four Elements 《四元玉鑒》 (1303), is his most important work. With this book, Zhu brought Chinese algebra to its highest level. It includes an explanation of his method of the four elements, which are used to signify four unknown quantities in a single algebraic equation. Zhu also explained how to find square roots and added to the understanding of series and progressions. The preface of the book describes how Zhu traveled around China for 20 years as a teacher of mathematics. // Events 24 February: Battle of Roslin 20 April: Pope Boniface VIII founds the University of Rome La Sapienza Edward I of England reconquers Scotland (see also: William Wallace, Wars of Scottish Independence) The Khilji Dynasty conquers time travel Births Saint Birgitta, Swedish saint (died 1373) Gegeen Khan, Mongol emperor of... In mathematics, a square root of a number x is a number whose square (the result of multiplying the number by itself) is x. ...

External links

• O'Connor, John J., and Edmund F. Robertson. "Zhu Shijie". MacTutor History of Mathematics archive.

wow i didn't know i was this smart! i'm shijie too. but i'm shijie zheng. i must be his great-great-great-great-greatgreat grandson or something and during 1 generation the zhu changed to zheng!. yeah thats it. thats where i get my maths talent from too. gangstar bro!.