Yaʿīsh ibn Ibrāhīm al-Umawī

"Al-Umawi" redirects here. For the Emir of Cordoba, see Abdullah ibn Muhammad al-Umawi.

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

• Ahmad Salim Saidan (ed.), Yaish ibn Ibrahim al-Umawi, On arithmetical rules and procedures (Aleppo, 1981).
• .