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Abu'l-Hasan al-Uqlidisi

10th century Islamic-world mathematician
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Abu'l Hasan Ahmad ibn Ibrahim Al-Uqlidisi (Arabic: أبو الحسن أحمد بن ابراهيم الإقليدسي‎) was a Muslim Arab mathematician, who was active in Damascus and Baghdad. He wrote the earliest surviving book on the positional use of the Arabic numerals, Kitab al-Fusul fi al-Hisab al-Hindi (The Arithmetics of Al-Uqlidisi) around 952. It is especially notable for its treatment of decimal fractions, and that it showed how to carry out calculations without deletions.

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