Positional decimal fractions appear for the first time in a book by the Arab mathematician Abu'l-Hasan al-Uqlidisi written in the 10th century.[10] The practice is ultimately derived from the decimal Hindu-Arabic numeral system used in Indian mathematics,[11] and popularized by the Persian mathematician Al-Khwarizmi,[12] when Latin translation of his work on the Indian numerals introduced the decimal positional number system to the Western world. His Compendious Book on Calculation by Completion and Balancing presented the first systematic solution of linear and quadratic equations in Arabic.