# Fibonacci

Leonardo of Pisa, who wrote under the pen name **Fibonacci**, may have been the greatest mathematician of the middle ages. His text *Liber Abaci*
introduced the Hindu-Arabic numeral system to Western Europe in 1202. He is now most remembered for a trivial problem in that text counting the number of
offspring of a pair of rabbits. Lucas called the sequence of numbers discussed by that problem the Fibonacci numbers.

**See Also:** FibonacciNumber

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