In Khwarizmis words"...what is easiest and most useful in arithmetic, such as men constantly require in cases of inheritance, legacies, partition, lawsuits, and trade, and in all their dealings with one another, or where the measuring of lands, the digging of canals, geometrical computations, and other objects of various sorts and kinds are concerned..."
• The Muslims invented the symbol for zero (The word "cipher" comes from Arabic )صفر • And they organized the numbers into the decimal system - base 10• Additionally, they invented the symbol toexpress an unknown quantity, i.e. variables like x
Muhammad ibn Musa al-Khwarizmi (780 A.D-840),Khwarzim Mathematician Astronomer Geographer
The word "algebra"comes from "Al-Jabr”,which is taken from thetitle of Khwarizmisbook “Hisab Al-Jabr wal Muqabala”
In this book Khwarizmi explained that the unknowns in oneside of the equation is called al-Jabr and collecting the knowns in the other side of the equation is called al- Mukabalah Manuscript copy of Hisab Al-Jabr wal Muqabala
Al-Khwarizmialso introduced the Arabic numerals