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Fibonacci

Also know as:Leonardo of Pisa, Leonardo Pisano, Leonardo Bonacci, Leonardo Fibonacci

c. 1170 c. 1250Lived

Known For:Fibonacci is best known to the modern world for the spreading of the HinduArabic numeral system in Europe, primarily through the publication in 1202 of his Liber Abaci (Book of Calculation), and for a number sequence named the Fibonacci numbers after him, which he did not discover but used as an example in the Liber Abaci.

Leonardo Fibonacci was born around 1170 to Guglielmo Bonacci, a wealthy Italian merchant. Guglielmo directed a trading post (by some accounts he was the consultant for Pisa) in Bugia, a port east of Algiers in the Almohad dynastys sultanate in North Africa (now Bejaia, Algeria). As a young boy, Leonardo traveled with him to help; it was there he learned about the HinduArabic numeral system.Recognizing that arithmetic with HinduArabic numerals is simpler and more efficient than with Roman numerals, Fibonacci traveled throughout the Mediterranean world to study under the leading Arab mathematicians of the time. Leonardo returned from his travels around 1200. In 1202, at age 32, he published what he had learned in Liber Abaci (Book of Abacus or Book of Calculation), and thereby popularized HinduArabic numerals in Europe.Leonardo became an amicable guest of the Emperor Frederick II, who enjoyed mathematics and science. In 1240 the Republic of Pisa honored Leonardo, referred to as Leonardo Bigollo, by granting him a salary.In the 19th century, a statue of Fibonacci was constructed and erected in Pisa. Today it is located in the western gallery of the Camposanto, historical cemetery on the Piazza dei Miracoli.About His Live

Fibonacci wrote the following books:Liber Abaci (1202), a book on calculations (English translation by Laurence Sigler, Springer, 2002)Practica Geometriae (1220), a compendium on geometry and trigonometry.Flos (1225), solutions to problems posed by Johannes of PalermoLiber quadratorum, ("The Book of Squares") on Diophantine equations, dedicated to Emperor Frederick II. See in particular the BrahmaguptaFibonacci identity.Di minor guisa (on commercial arithmetic; lost)Commentary on Book X of Euclid's Elements (lost)

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