Abū al-Ḥassan, Aḥmad Ibn Ibrāhīm, al-Uqlīdisī (Arabic: أبو الحسن أحمد بن ابراهيم الإقليدسي, fl.
[1] The book is well preserved in a single 12th century manuscript,[2] but other than the author's name, original year of publication (341 AH, 952/3 AD) and the place (Damascus) we know nothing else about the author: after an extensive survey of extant reference material, mathematical historian Ahmad Salīm Saʿīdān, who discovered the manuscript in 1960, could find no other mention of him.
[1] His nickname al-Uqlīdisī ("the Euclidean") was commonly given to people who sold manuscript copies of Euclid's Elements.
It is especially notable for its treatment of decimal fractions, and for showing how to calculate using pen and paper rather than an erasable dust board.
[3] A. S. Saidan who studied al-Uqlidisi's mathematical treatise in detail wrote: The most remarkable idea in this work is that of decimal fraction.