(about ad 800)
Mathematician and astronomer of Baghdad, the author of two important Arabic works on arithmetic and algebra. The word ‘algorithm’ is derived from the occurrence of his name in the title of the work that includes a description of the Hindu–Arabic number system. The word ‘algebra’ comes from the title Al-jabr wa’l muqābalah of his other work, which contains, among other things, methods of solving quadratic equations by a method akin to completing the square.
Subjects: Mathematics — Islam.