Little is known of his life, and no portrait exists. Leonardo Pisano, or ‘Fibonacci,’ was a self-professed student of the arts of Greek theologian and mathematician Pythagoras (c. 569 – 475 BCE), who coined the term ‘mathematics’ (Μάθημα, ατος, τo, that which is learned) to represent that abstract science which … The Book of Squares He also wrote other books, some of which were solely for pure mathematicians. This is the only page on Who was Fibonacci? Date unknown: Di Minor Guisa (A Smaller Manner) a book on commercial arithmetic. Imagine, though, trying to multiply Q × S (the 17th and 19th letters of the alphabet). He got the nickname of Fibonacci when he started writing, like many authors do. The exact date of his birth is not known. The book describes (in Latin) the rules we all now learn at elementary school for adding numbers, subtracting, multiplying and dividing, together with many problems to illustrate the methods: In this simple system, using addition only, 99 would be 90+9 or, using only the numbers above, 50+10+10+10 + 5+1+1+1+1 which translates to LXXXXVIIII and by the same method 1998 would be written by the Romans as MDCCCCLXXXXVIII. Fibonacci’s Name His real name is Leonardo of Pisa or Pisano. Common Fibonacci numbers in financial markets are 0.236, 0.382, 0.618, 1.618, 2.618, 4.236. Fibonacci. Today the system is most often called the Hindu-Arabic number system. The subtraction in numbers was only of a unit (1, 10 or 100) taken away from 5 of those units (5, 50 or 500 or from the next larger multiple of 10 (10, 100 or 1000). Some of the topics Fibonacci considered in his book were: the new numbers; multiplication and addition; subtraction; division; fractions; rules for money; accounting; quadratic and cube roots; quadratic equations; binomials; proportion; rules of algebra; checking calculations by casting out nines; progressions; and applied algebra. In 1202 he published Liber Abaci – the Book of Calculation – which began the spread of the modern number system in the West. His father did a great deal of work in North Africa and young Fibonacci would travel with him. The original problem that Fibonacci investigated (in the year 1202) was about how fast rabbits could breed in ideal circumstances. His father Guglielmo Bonacci was a wealthy Italian merchant, who represented merchants of the Republic of Pisa who were trading in Bugia (now Béjaïa) in Algeria, North Africa. The Italian mathematician known as Fibonacci was actually born Leonardo da Pisa in 1175 to Guglielmo Bonaccio, a Pisan merchant (it is believed the name Fibonacci is a derivative of the Latin "filius Bonacci" or "son of the Bonacci"). It is believed Fibonacci was born between the years 1170-75 and died around the years 1240-50. This website uses cookies to improve your experience. Leonardo’s mother, Alessandra, died when he was nine years old. D E Knuth (in the errata for the second edition and third edition of his "Fundamental Algorithms") gives the full name above and says it can be translated as Father of Abdullah, Mohammed, son of Moses, native of Khwarizm. Fibonacci’s Book of Calculation was also important for European commerce and finance. Earlier the Persian author Abu ‘Abd Allah, Mohammed ibn Musa al-Khwarizmi (usually abbreviated to Al-Khwarizmi had written a book which included the rules of arithmetic for the decimal number system we now use, called Kitab al jabr wa‘l-muqabala (Rules of restoring and equating) dating from about 825 AD. His father, Guglielmo Bonacci, was an affluent Italian merchant who was also believed to be a consul for Pisa. Leonardo's father, Guglielmo Bonacci, was a kind of customs officer in the present-day Algerian town of Béjaïa, (see Bejaia on Google Earth ) formerly known as Bugia or Bougie, where wax candles were exported to France. He gave his readers following question about rabbit breeding: How many rabbits will born from one pair of rabbits in one year? Leonardo Pisano was born late in the twelfth century in Pisa, Italy: Pisano in Italian indicated that he was from Pisa, in the same way Mancunian indicates that I am from Manchester. He got the nickname of Fibonacci when he started writing, like many authors do. Leonardo’s mother, Alessandra, died when he was nine years old. Leonardo Fibonacci was born in Pisa, Italy around 1170.

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