Omar Khayyam: much more than a poet. Robert Green.
Montgomery College Student Journal of Science and Mathematics 1 (2002) (Sept.)

Omar Khayyam, although well known for his poetry, was also an accomplished mathematician, scientist, astronomer, and philosopher. In fact, his contributions include the Jaláli Calendar, astronomical tables, and contributions to mathematics, especially in Algebra. He wrote, “Maqalat fi al-Jabr al-Muqabila,” in this area of mathematics, which many claim provided great advancement in the field.