Yaʿīsh ibn Ibrāhīm al-Umawī

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

Works

• 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).

References

• 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 0-684-10114-9. 
• 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 .

External links