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 al-Abbas Iranshahri Abu al-Abbas Iranshahri (Persian: حکیم ایرانشهری‎ ‎ ) was a 9th-century Persian philosopher, mathematician, natural scientist, historian of religion, astronomer and author. According to traditional sources, he is the first figure in the wider Muslim world to be associated with philosophy after the advent of Islam.