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An Identity of Andrews and a New Method for the Riordan Array Proof of Combinatorial Identities

Authors
  • Brietzke, Eduardo H. M.
Type
Preprint
Publication Date
Mar 19, 2008
Submission Date
Mar 19, 2008
Source
arXiv
License
Yellow
External links

Abstract

We consider an identity relating Fibonacci numbers to Pascal's triangle discovered by G. E. Andrews. Several authors provided proofs of this identity, most of them rather involved or else relying on sophisticated number theoretical arguments. We present a new proof, quite simple and based on a Riordan array argument. The main point of the proof is the construction of a new Riordan array from a given Riordan array, by the elimination of elements. We extend the method and as an application we obtain other identities, some of which are new. An important feature of our construction is that it establishes a nice connection between the generating function of the $A-$sequence of a certain class of Riordan arrays and hypergeometric functions.

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