is called zephirum, any number can be written, as will be demonstrated. He also introduced a series in Liber Abacci. It is the Fibonacci sequence, named in his honor. The series begins with 0 and 1. After that, he added the last two numbers to get the next (1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987,...)He discovered it as a solution to. In 1225 Fibonacci took part in a tournament at Pisa ordered by the emperor himself, Frederick II. It went as follows:Beginning with a single pair of rabbits, if every month each productive pair bears a new pair, which becomes productive when they are 1 month old, how many rabbits will there be after n months? After 1228, virtually nothing is known of Leonardo's life, except that by decree the Republic of Pisa awarded the "'serious and learned Master Leonardo Bigollo' (discretus et sapiens) a yearly salarium of 'libre XX denariorem' in addition to the usual allowances" . This stipend rewarded Fibonacci for his pro bono advising to the Republic on matters involving accounting and related mathematical matters. Fibonacci died some in 1250, presumably in Pisa. ...
