Great Mathematicians · Foundations
Fibonacci
Leonardo of Pisa's 1202 Liber Abaci brought Hindu-Arabic numerals and commercial arithmetic to Europe; the rabbit puzzle gave us the famous sequence, its link to the golden ratio, and the myths around it.
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Key idea
Prereqs: Al-Khwarizmi (algebra). Next: Sequences & series; Compound interest. Sources: L.E. Sigler (trans.), *Fibonacci's Liber Abaci* (2002); Keith Devlin, *The Man of Numbers* (2011).Next: 1. The book that changed commerce