Kuhi
Abu Sahl Wijan (or Waijan) ibn Rustam al-Kuhi (also al-Quhi), was a Persian mathematician and astronomer. Kuhi was from Kuh (or Quh), a town in Tabaristan, and flourished in Baghdad in the 10th century. Many mathematical and astronomical writings are ascribed to him. He was the leader of the astronomers working in 988AD at the observatory built by the Buwayhid Sharaf al-dawla. He devoted his attention to those Archimedian and Apollonian problems leading to equations of a higher degree than the second; He solved some of them and discussed the conditions of solvability. These investigations are among the best of Muslim geometry.
Sources M. Steinschnieder: Lettere intorno ad Alcuhi a D. Bald. Boncompagni (Roma, 1863). Suter: Die Mathematiker und Astronomen der Araber (75-76, 1900).
See also Quhi's Biography on St Andrew's School of MAthematics in Scotland
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