Abu Ja'far al-Khwarizmi
Abu Ja'far al-Khwarizmi was an Arab mathematician who lived between 780-850. At a time when the diffusion of ideas was very slow due to the lack of cross-cultural communication, al-Khwarizmi wrote a book which contained many important mathematical concepts of the Middle East.
This book revolutionized western (European) mathematics: It introduced
the decimal system, as well as rules for solving equations and doing geometry.
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