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Cassini and Catalan identities : ウィキペディア英語版 | Cassini and Catalan identities Cassini's identity and Catalan's identity are mathematical identities for the Fibonacci numbers. The former is a special case of the latter, and states that for the ''n''th Fibonacci number, : Catalan's identity generalizes this: : Vajda's identity generalizes this: : == History ==
Cassini's formula was discovered in 1680 by Jean-Dominique Cassini, then director of the Paris Observatory, and independently proven by Robert Simson (1753). Eugène Charles Catalan found the identity named after him in 1879.
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