Muhammad al-Baghdadi

Abū Bakr Muḥammad Ibn ‘Abd al-Bāqī al-Baghdadi al-Ansārī al-Kaabī^[1][2] (1050-1141) (Arabic: محمد بن عبد الباقي البغدادي) also known as Qadi al-Maristan, was an Arab^[1] jurist and mathematician.

He was the author of a commentary on the tenth book of Euclid's Elements, which was translated by Gerard of Cremona as Liber judei super decimum Euclidis.^[3] The work was popular in Europe with several Latin manuscripts still extant.

Other works include:^[4]

• Jadawil al-Jayb al-Mahlul al-Daqiqa (detailed tables of sines for each minute),
• Risala fi Taqrib Usul al-Hisab fi' al-Jabr wa-‘l-Muqabala (Treatise on approximation of principles of arithmetic)
• Kitab al-Tabaqat fi Sharh al-Misaha (book on measurements)