Who covered the most disciplines, Abū Sahl al-Qūhī or Al-Farabi?
Abū Sahl al-Qūhī Abū Sahl Wayjan ibn Rustam al-Qūhī (al-Kūhī ; Persian: ابوسهل بیژن کوهی‎ ‎ "Abusahl Bijan-e Koohi") was a Persian mathematician, physicist and astronomer. He was from Kuh (or Quh), an area in Tabaristan, Amol, and flourished in Baghdad in the 10th century. He is considered one of the greatest Muslim geometers, with many mathematical and astronomical writings ascribed to him.
Abu Bakr Ibn Mujāhid Abū Bakr Ibn Mujāhid (Arabic: ابن مجاهد) (Full name: أبو بكر أحمد بن موسى بن العباس بن مجاهد التميمي) (born 245AH/859-860CE in Baghdad and died 324AH/936CE) was a scholar of Islamic studies. He studied Qur'ān and Hadith in Baghdad. He was most notable for establishing the seven canonical Qur'anic readings (Qira'at). He was also notable for delivering the charge of heretical Qur'anic exegesis that reopened the trial of Mansur al-Hallaj, and ultimately led to his execution by the Abbasid Caliphate al-Muqtadir.