Abu Sahl al-Quhi ابوسهل بیژن ابن رستم کوهی
Full Name: Abu Sahl Wayjan ibn Rustam al-Kuhi.
Arabic: ابوسهل بیژن ابن رستم کوهی
Origin: Kuh (or Quh), an area in Tabaristan Persia, Iran.
Born: 940 AD.
Dies: 1,000 AD.
Famous for: Mathematician, Physicist and Astronomer.
Contribution:
Al-Quhi was the leader of the astronomers working in 988 AD at the observatory built by the Buwayhid amir Sharaf al-Dawla in Badhdad
Inscribing an equilateral pentagon into a square, resulting in a fourth degree equation
Articles
https://ismi.mpiwg-berlin.mpg.de/person/50990
https://en.wikipedia.org/wiki/Abu_Sahl_al-Quhi
https://mathshistory.st-andrews.ac.uk/Biographies/Al-Quhi/
http://nataatmadja.blogspot.com/2015/06/940-c-1000-abu-sahl-wayjan-ibn-rustam.html
https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/al-quh
https://handwiki.org/wiki/Biography:Ibn_Sahl_(mathematician)