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Abū ʿAbdallāh Yaʿīsh ibn Ibrāhīm ibn Yūsuf ibn Simāk al-Andalusī al-Umawī (1400? in Andalusia, Spain – 1489? in Damascus, Syria?) was a 14th-century mathematician.

Marasim al-intisab fi'ilm al-hisab ("On arithmetical rules and procedures"), first date written in 1373 and hence the birth date above is controversial.
Raf'al-ishkal fi ma'rifat al-ashkal (a work on mensuration).


Saidan, A. S. (1970). "Al-Umawī, Abū ‘Abdallāh Ya‘īsh Ibn ibrāHīm Ibn Yūsuf Ibn Simāk Al-Andalusī". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. ISBN 0684101149.
Ahmad Salim Saidan (ed.), Yaish ibn Ibrahim al-Umawi, On arithmetical rules and procedures (Aleppo, 1981).
O'Connor, John J.; Robertson, Edmund F., "Yaʿīsh ibn Ibrāhīm al-Umawī", MacTutor History of Mathematics archive, University of St Andrews.


Mathematics Encyclopedia

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