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.
Al-Humaydi Imam al-Humaydi was a hafiz, faqih from Shafi'i jurisprudence scholar and Shaykh of the al-Haram. He studied under Imam Shafi'i himself in his majlis. He also studied and narrated hadith from Sufyan ibn Uyainah and Fudhail ibn Iyadh. His pupils included "Al-Aimah" such as Al-Bukhari, An-Nasa'i, At-Turmudhi, Abu Zur'a al-Razi and Abu Hatim al-Razi. He died in Mecca in 219 AH.