Al-Karaji
（重定向自Karaji）
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Abū Bakr ibn Muḥammad ibn al Ḥusayn al-Karajī (c. 953 – c. 1029) was a 10th-century Iranian mathematician and engineer who flourished at Baghdad. He was born in Karaj, a city near Tehran. His three principal surviving works are mathematical: Al-Badi' fi'l-hisab (Wonderful on calculation), Al-Fakhri fi'l-jabr wa'l-muqabala (Glorious on algebra), and Al-Kafi fi'l-hisab (Sufficient on calculation).