What was the pseudonym of the mathematician Leonardo Bonacci (1170-1240)?
Fibonacci Fibonacci Fibonacci (c. 1175 – c. 1250) was an Italian mathematician from the Republic of Pisa, considered to be "the most talented Western mathematician of the Middle Ages". The name he is commonly called, "Fibonacci" (), was made up in 1838 by the Franco-Italian historian Guillaume Libri and is short for ("son of Bonacci") and he is also known as Leonardo Bonacci, Leonardo of Pisa, or Leonardo Bigollo ("traveller") Pisano. Fibonacci popularized the Hindu–Arabic numeral system in the Western World primarily through his composition in 1202 of "Liber Abaci" ("Book of Calculation"). He also introduced Europe to the sequence of
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