Philip Matchett Wood and Doron Zeilberger have constructed identities for the
Fibonacci numbers $f_n$ of the form $1f_n = f_n$ for all $n \geq 1$; $2f_n =
f_{n-2} + f_{n+1}$ for all $n \geq 3$; $3f_n = f_{n-2} + f_{n+2}$ for all $n
\geq 3$; $4f_n = f_{n-2} + f_{n} + f_{n+2}$ for all $n \geq 3$; ...; the
general identity in this family has the form $kf_n = \sum_{s \in S_k} f_{n+s}$
(for all sufficiently high $n$), where $S_k$ is a finite set of integers that
depends only on $k$ and contains no two consecutive integers. These identities
are generalized, replacing the left-hand side $kf_n$ by arbitrary sums of the
form $f_{n+a_1} + f_{n+a_2} + \cdots + f_{n+a_p}$ for arbitrary integers $a_1,
a_2, \ldots, a_p$. The resulting theorem is proved using the connection between
the Fibonacci numbers and the golden ratio.
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Details
Title
Zeckendorf family identities generalized
Creators
Darij Grinberg
Publication Details
arXiv (Cornell University)
Resource Type
Preprint
Language
English
Academic Unit
Mathematics
Other Identifier
991021862235604721
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