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.
Muhammad ibn al Uthaymeen Abu 'Abd Allah Muhammad ibn Saalih ibn Muhammad ibn Sulayman ibn Abd Al Rahman Al Uthaymeen Al Tamimi (Arabic: أبو عبد الله محمد بن صالح بن محمد بن سليمان بن عبد الرحمن العثيمين التميمي) (March 9, 1925 – January 10, 2001) was a Sunni scholar of Saudi Arabia who was considered "a giant within conservative Salafi Islam".