Abū al-Jūd, Muḥammad b. Aḥmad b. al-Layth, was a well-known Iranian mathematician who lived during the 4th/10th century. There is very little information on his life, with no details about where he was born, lived or died. He seems to have lived within the territories of the Sāmānid kingdom, probably somewhere to the east of Khurāsān. Ṣāʿid al-Andalusī claims that he lived in Valencia (Balansiya), where he was a judge, and that he died in 405/1014 or 1015 (p. 73; s…