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The Liber quadratorum alone ranks Fibonacci as the major contributor to number theory between Diophantus and the 17th-century French mathematician Pierre de Fermat.
Encyclopaedia Britannica
Fibonacci Numbers
Leonardo Pisani
Definition of Fibonacci numbers
Binet’s formula
Cassini’s identity
Generating series for Fibonacci numbers
Jones characterization
Computing Fibonacci numbers
Matrix identities
Knuth product