Chapter Seven on the Science of Arithmetic in the African Language (Correlation) Know that the science of correlation is one of the pure mathematical sciences, because the wise men of the Franks divided mathematics into pure and impure or mixed. The pure mathematical sciences are the science of arithmetic, algebra, geometry, and the like. As for the mixed mathematics, they are the sciences of stratagems, the art of moving and transferring, and the like. Mixed mathematics deal with quantities and things subject to increase and decrease, and mixed mathematics involve external things from natural science and others. Arithmetic is the most important of the mathematical sciences. Historical books indicate that the founders of this science were the people of Syria, meaning the Syrians, and the ancient people of Egypt, meaning that these two nations were the first to collect numbers and arithmetic and their system in ordered arrangements. So much so that the wise Pythagoras traveled from Greece to Egypt and developed this science there. It is also famous among the ancients that the science of arithmetic is an invention of the Syrians, and it is said that they were also the first to use tables, ledgers, and displays. The fingers are the first methods that humans used in calculation, and this is the reason why the first arrangement in numbers is the tens, and the second is the tens of hundreds, which are the hundreds, and the third is the tens of thousands, and so on, because the fingers are ten. Thus, the transition from one arrangement to another was from ten to ten. Since the fingers were not enough to distinguish more than ten at a time, another method and other signs were needed. So they took the yellow of fever, grains of sand, and cups, and the like, and used them to record counted items, as is now the case with some Americans and some