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Pisa British & World English

A city in west central Italy, in Tuscany, on the River Arno; population 87,398 (2008). It is noted for the ‘Leaning Tower of Pisa’, a circular bell tower which leans about 5 m (17 ft) from the perpendicular over its height of 55 m (181 ft)

Fibonacci, Leonardo British & World English

(Circa 1170-circa 1250), Italian mathematician; known as Fibonacci of Pisa. Fibonacci popularized the use of the ‘new’ Arabic numerals in Europe. He made many original contributions in complex calculations, algebra, and geometry, and pioneered number theory and indeterminate analysis, discovering the Fibonacci series

Fibonacci of Pisa in Fibonacci, Leonardo British & World English

(Circa 1170-circa 1250), Italian mathematician; known as Fibonacci of Pisa. Fibonacci popularized the use of the ‘new’ Arabic numerals in Europe. He made many original contributions in complex calculations, algebra, and geometry, and pioneered number theory and indeterminate analysis, discovering the Fibonacci series