The sequence of the Fibonacci numbers is considered to have been discovered by Leonardo of Pisa, better known as "Fibonacci," a 13th-century Italian mathematician. In the early 1200s, after traveling through parts of the Middle East and studying with Arab mathematicians, Fibonacci published his book Liber Abaci, or "Book of Calculation." This book introduced the West to something that is one of the greatest discoveries of all time: the decimal numeration system, including the position of zero as the first number in the number sequence.
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