Abu'l Hasan al-Uqlidisi
Abu'l Hasan al-Uqlidisi, c. AD 920–c. AD 980, Arab mathematician working in Damascus and Baghdad. He wrote (952–53) a treatise on arithmetic and Arabic numerals that is the first known work to deal directly with decimal fractions.
"Abu'l Hasan al-Uqlidisi." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 25, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/abul-hasan-al-uqlidisi
"Abu'l Hasan al-Uqlidisi." The Columbia Encyclopedia, 6th ed.. . Retrieved September 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/abul-hasan-al-uqlidisi