Ya'ish ibn Ibrahim al-Umawi

Abū ʿAbdallāh Yaʿīsh ibn Ibrāhīm ibn Yūsuf ibn Simāk al-Andalusī al-Umawī (يعيش بن إبراهيم بن يوسف بن سماك الأموي الأندلسي) (1400? in Al-Andalus – 1489 in Damascus, Syria) was a 15th-century Spanish-Arab 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).