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.
Saadi Shirazi Abū-Muhammad Muslih al-Dīn bin Abdallāh Shīrāzī (Persian: ابومحمد مصلح‌الدین بن عبدالله شیرازی‎ ‎ ), better known by his pen-name Saadi (سعدی "Saʿdī"(   )), also known as Saadi of Shiraz (سعدی شیرازی "Saadi Shirazi"), was a major Persian poet and literary of the medieval period. He is recognized for the quality of his writings and for the depth of his social and moral thoughts. Saadi is widely recognized as one of the greatest poets of the classical literary tradition, earning him the nickname "Master of Speech" (ارباب سخن ) or "The Master" among Persian scholars. He has been quoted in the Western traditions as well.