This form of fraction with numerator on top and denominator at bottom without a horizontal bar in between, was transmitted to Arabic country in a 825AD book by al Khwarizmi via India, and in use by 10th century Abu'l-Hasan al-Uqlidisi and 15th century Jamshīd al-Kāshī's work "Arithematic Key".
Abu al-Hakim Muhammad ibn Abd al-Malik al-Salihi al-Khwarizmi al-Khati, Al-Khati (flourished 1034), was a Muslim alchemist from the village of Kath in the Khwarezm region.
Special attention is paid to the main thinkers of the period of splendor of Islamic civilization (8th to 12th centuries), like Avicenna, Averroes, Omar Khayyam and Al-Khwarizmi.