Mathematician:Leonardo Fibonacci

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Italian mathematician.

One of the most important figures in the history of the development of mathematics.

Wrote the highly influential and important Liber Abaci in which he discussed the Hindu-Arabic number system and its practical applications.

Most famous for the Fibonacci numbers. The number sequence itself was known to Indian mathematicians as early as the $6$th century, but it was Fibonacci's Liber Abaci which made them well-known throughout Europe.




  • Born: c. 1170
  • Died: c. 1250

Theorems and Definitions

Concepts derived from Fibonacci numbers

Results named for Leonardo Fibonacci can be found here.

Definitions of concepts named for Leonardo Fibonacci can be found here.


Critical View

Fibonacci was by far the greatest European mathematician of the Middle Ages.
-- 1997: Donald E. Knuth: The Art of Computer Programming: Volume 1: Fundamental Algorithms (3rd ed.)

Also known as

Leonardo Fibonacci also known as Leonardo of Pisa, Leonardo Pisano, Leonardo Bonacci or usually just Fibonacci.

The name Fibonacci comes (posthumously) from filius Bonacci, that is: son of Bonacci (his father was nicknamed Bonacci, meaning good-natured or simpleton). These were the days before official surnames.

An ironic soubriquet.

Linguistic Note

Fibonacci is an Italian surname whose pronunciation is something like Fib-bo-nat-chi, or Fib-bo-nar-chi, according to taste.

Avoid pronouncing it Fie-bo-nac-ky.