Zîcü’s-Sind-Hind [Zîcü’l-Hârizmî] (It is based on a book brought to Baghdad by the Indian committee during the time of the Caliph Mansûr named Brahma-gupta Sidharta or on another book with the same name. Hârizmî added new information to the book with his inventions. It was the first Islamic astronomy book), Kitâbü’l-Muhtaşar fî hisâbi’l-cebr ve’l-mukâbele (The first math book that had the “algebra" word in its name compiled methodically. The algebra developed by Hârizmî was the algebra limited to second-order equation above all. Besides, no negative numbers were used, so the determination of the equation was only done by finding the positive roots. Based on Harizmî’yi- İbn-i Haldun, Kâtip Çelebi was shown as the first author to write a book on Algebra with Keşf-üz-Zünun),Kitâbü'l-Hisâbi'l-Hindî (The Indian numbers and the decimal number system was introduced to the Islamic world with this book of Hârizmî), Kitâbü'İ-Cem ve'l-Tetrîk (This book didn’t reach today,
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