Difference between revisions of "Catalan's identity"

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Revision as of 00:52, 25 May 2017

Theorem

The following formula holds: $$F_n^2 - F_{n+r} F_{n-r} = (-1)^{n-r}F_r^2,$$ where $F_n$ denotes the $n$th Fibonacci number.

Proof

See also

Cassini's identity

References