Al-Samaw’al, Ibn Yah?ya Al-Maghribi | Encyclopedia.com (неопр.). www.encyclopedia.com. — «Al-Samaw‘al further applied the rules of subtraction to the multiplication and division of the powers of x, which he placed in a single line of both sides of the number 1, to which he assigned the rank zero. The other powers and other constants are displayed on each side of zero, in ascending order:
The rules of multiplication and division that al-Samaw‘al enunciated are, except for their notation, those still in use.» Дата обращения: 16 сентября 2024.
