Abu'l Hasan Ahmad ibn Ibrahim Al-Uqlidisi

Abu'l Hasan Ahmad ibn Ibrahim Al-Uqlidisi is an Arab mathematician, who is active in Damascus and Baghdad.

As his surname indicates, he is a copyist of Euclid's works.

He writes the earliest surviving book on the positional use of the Arabic numerals, Kitab al-Fusul fi al-Hisab al-Hindi (The Arithemetics 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.

While the Persian mathematician Jamshīd al-Kāshī will claime to have discovered decimal fractions himself in the fifteenth century, J. Lennart Berggrenn notes that he was mistaken, as decimal fractions were first used five centuries before him by al-Uqlidisi as early as the tenth century.

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