"The Man of Numbers: How Fibonacci Changed the World"

From Brain Pickings:

What Medieval mathematics have to do with remix culture, publishing entrepreneurship, and gamification.

Imagine a day without numbers — how would you know when to wake up, how to call your mother, how the stock market is doing, or even how old you are? We live our lives by numbers. They’re so fundamental to our understandig of the world that we’ve grown to take them for granted. And yet it wasn’t always so. Until the 13th century, even simple arithmetic was mostly accessible to European scholars. Merchants kept track of quantifiables using Roman numerals, performing calculations either by an elaborate yet widespread fingers procedure or with a clumsy mechanical abacus. But in 1202, a young Italian man named Leonardo da Pisa — known today as Fibonacci — changed everything when he wrote Liber Abbaci, Latin for Book of Calculation, the first arithmetic textbook of the West.

Keith Devlin tells his incredible and important story in The Man of Numbers: Fibonacci’s Arithmetic Revolution, tracing how Fibonacci revolutionized everything from education to economics by making arithmetic available to the masses. If you think the personal computing revolution of the 1980s was a milestone of our civilization, consider the personal computation revolution. And yet, Leonardo’s cultural contribution is hardly common knowledge.

The change in society brought about by the teaching of modern arithmetic was so pervasive and all-powerful that within a few generations people simply took it for granted. There was no longer any recognition of the magnitude of the revolution that took the subject from an obscure object of scholarly interest to an everyday mental tool. Compared with Copernicus’s conclusions about the position of Earth in the solar system and Galileo’s discovery of the pendulum as a basis for telling time, Leonardo’s showing people how to multiply 193 by 27 simply lacks drama.” ~ Keith Devlin

The Latin phrase 'filius bonacci,' in the first line of the Liber Abbaci manuscript, gave rise to Leonardo da Pisa's modern nickname, Fibonacci
Image courtesy of The Library of Florence via NPR

Though “about” mathematics, Fibonacci’s story is really about a great number of remarkably timely topics: gamification for good (Liber abbaci brimmed with puzzles and riddles like the rabbit problem to alleviate the tedium of calculation and engage readers with learning); modern finance (Fibonacci was the first to develop an early form of present-value analysis, a method for calculating the time value of money perfected by iconic economist Irving Fisher in the 1930s); publishing entrepreneurship (the first edition of Liber Abbaci was too dense for the average person to grasp, so da Pisa released — bear in mind, before the invention of the printing press — a simplified version accessible to the ordinary traders of Pisa, which allowed the text to spread around the world); abstract symbolism (because numbers, as objective as we’ve come to perceive them as, are actually mere commonly agreed upon abstractions); and even remix culture (Liber Abbaci was assumed to be the initial source for a great deal of arithmetic bestsellers released after the invention of the printing press.)...MORE