Topic

Cassini's identity.

mathematical identity: F_{n - 1}F_{n + 1} - F_n^2 = (-1)^n

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About Cassini's identity

Cassini's identity, Catalan's identity and Vajda's identity are mathematical identities for the Fibonacci numbers. Cassini's identity, a special case of the other two, states that for the nth Fibonacci number,

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