Fouchécour, Ch.-D. de
'Umar Khayyám. Ch.-D. de Fouchécour.
In: Encyclopedia of Islam. New. ed. 1994. Vol. 10, p. 827-831.
Al-Imām Abū Ḥafṣ ʿUmar b. Ibrāhīm al-Ḵh̲ayyāmī is thus named in the Mīzān al-ḥikma which ʿAbd al-Raḥmān al-Ḵh̲āzinī composed in 515/1121, often mentioning Ḵh̲ayyām for his scientific works. Abū Ḥafṣ is a kunya customarily associated with the name ʿUmar, and al-Ḵh̲ayyāmī is the form which would be expected in an Arabic work.