Indeed, the person we call Fibonacci was actually named Leonardo of Pisa, and these numbers appear in his book "Liber Abaci," which taught the Western world the methods of arithmetic that we use today.
La persona a qui anomenem Fibonacci es deia Leonardo da Pisa, i aquests nombres apareixen al seu llibre "Liber Abaci", que va descobrir al món occidental els mètodes aritmètics que s'usen avui en dia.