In the ninth century AH, the mathematician Jamsheed Bin Masoud Al-Kashi, also known as Ghiyath Al-Din, invented the decimal comma, completing what had been started earlier by Al - Khawarizmi who added the zero to the group of natural numbers, those significant achievements contributed to the development of the science of mathematics, and hundreds of years later paved the road to the invention of calculators and computers.
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