Ya'ish ibn Ibrahim al-Umawi explained

Abū ʿAbdallāh Yaʿīsh ibn Ibrāhīm ibn Yūsuf ibn Simāk al-Andalusī al-Umawī (1400? in Al-Andalus – 1489 in Damascus, Syria) was a 15th-century Spanish-Arab^[1] 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).

Bibliography

• Encyclopedia: Saidan . A. S. . Al-Umawī, Abū 'Abdallāh Ya'īsh Ibn ibrāHīm Ibn Yūsuf Ibn Simāk Al-Andalusī . . Charles Scribner's Sons. New York. 1970. 0-684-10114-9.
• Ahmad Salim Saidan (ed.), Yaish ibn Ibrahim al-Umawi, On arithmetical rules and procedures (Aleppo, 1981).

Notes and References

1. Book: Gibb. Hamilton Alexander Rosskeen. Kramers. Johannes Hendrik. Lewis. Bernard. Pellat. Charles. Schacht. Joseph. The Encyclopaedia of Islam. 1970. Brill. en.