The Man of Numbers: Fibonacci's Arithmetic Revolution Review

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The Man of Numbers: Fibonacci's Arithmetic Revolution ReviewA man went on business to Lucca, Florence, and then Pisa. In each city, he doubled his money, then spent 12 denari. At the end, he had no money. How much did he start with?
This and hundreds of other math-heavy financial questions were asked in Liber Abaci, or "The Book of Calculation", published in 1202 by Leonardo of Pisa, who became better known as Fibonacci. The book is led to the European popularization of 9 8 7 6 5 4 3 2 1 0 -- the Hindu-Arabic number system.
Why? It was faster than the Roman method. The many questions were aimed at merchants. It was profitable. The merchants who used the methods in Liber Abaci were able to beat their competitors, and this caused the new methods to see widespread usage throughout Europe. Now, to a modern reader, Liber Abaci's six hundred pages of detailed calculations for how to make money conversions, tariff fees, and business transactions with a variety of obsolete currencies may seem like a tedious read. To a merchant of the era, some subset of the pages gave exact instructions for how to make more money.
The 13th century merchants of Pisa, Genoa, Milan, and Florence all took up the new mathematical system. At the time, there were other influential books for merchants. With Liber Abaci, they formed the initial core set for business math.
Forensic analysis of the other books was done a few years ago, and it revealed that Fibonacci was the author of the other influential books, as well.
Keith Devlin gives both the ancient and modern history. I had the privilege of seeing his presentation for The Man of Numbers at a recent math conference, and it was all a fascinating, gigantic story.
For the Kindle, there is a shorter companion book by the same author: Leonardo and Steve: The Young Genius Who Beat Apple to Market by 800 Years.

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