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Iranian scientists
Nasavi, mathematician
Abu l'Hasan Ali ibn Ahmad Al-Nasawi (Arabic: أبو الحسن علي بن أحمد النسوي), also spelled Nasavi, (1010 - 1075), was a Persian mathematician from Khurasan, Iran.
He flourished under the Buwayhid sultan Majd al-dowleh, who died in 1029-30AD, and under his successor. He wrote a book on arithmetic in Persian, and then Arabic, entitled the "Satisfying (or Convincing) on Hindu Calculation" (al-muqni fi-l-hisab al Hindi). He also wrote on Archimedes's lemmata and Menelaus's theorem (Kitab al-ishba, or "satiation"). where he made corrections to The Lemmata as translated into Arabic by Thabit ibn Qurra, which was last revised by Nasir al-Din al-Tusi.
Nasawi's arithmetic explains the division of fractions and the extraction of square and cubic roots (square root of 57,342; cubic root of 3, 652, 296) almost in the modern manner. It is remarkable that al-Nasawi replaces sexagesimal by decimal fractions.
Source #2 given below also gives an analysis of a mid-12th century manuscript in which a summary of Euclid's Elements exists by al-Nasawi.
He is thought to have died in about 1075 A.D. in Baghdad, Iraq.
Source: wikipedia.org
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