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.
Ibn Abi Zar Abū al-Hassan ‘Alī ibn Abī Zar‘ al-Fāsī (Arabic: أبو الحسن علي بن أبي زرع الفاسي‎ ‎ ) (d. between 1310 and 1320) is the commonly presumed original author of the popular and influential medieval history of Morocco known as "Rawd al-Qirtas", said to have been written at the instigation of Marinid Sultan Abu Sa'id Uthman II. His full nasab is sometimes given as "ibn Abd Allah ibn Abi Zar" and sometimes as "ibn Muhammad ibn Ahmad ibn Umar ibn Abi Zar". The uncertainty about his name and authorship of the Rawd is caused by the many variant manuscripts in circulation since the Middle Ages. Very little is known about his life except that he was evidently a scholar at Fes.