Abstract
The focus of this paper is the study of generalized Fibonacci polynomials and Fibonomial coefficients. The former are polynomials \({\{n\}}\)in variables s,t given by \({\{0\} = 0, \{1\} = 1}\), and \({\{n \} = s\{n - 1 \} +t\{n - 2 \}}\) for \({{n \geq 2}}\) . The latter are defined by \({\left\{\begin{array}{ll} n\\ k \end{array}\right\} = \{ n \}! / (\{ k \}!\{ n - k \}!)}\) where \({{\{n \}! = \{1 \}\{2 \}\cdots\{n \}}}\). These quotients are also polynomials in s, t and specializations give the ordinary binomial coefficients, the Fibonomial coefficients, and the q-binomial coefficients. We present some of their fundamental properties, including a more general recursion for \({\{n\}}\) , an analogue of the binomial theorem, a new proof of the Euler- Cassini identity in this setting with applications to estimation of tails of series, and valuations when s and t take on integral values. We also study a corresponding analogue of the Catalan numbers. Conjectures and open problems are scattered throughout the paper.
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Xi Chen: Research partially supported by a grant from the China Scholarship Council.
Victor H. Moll: Research partially supported by the National Science Foundation NSF-DMS 1112656.
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Amdeberhan, T., Chen, X., Moll, V.H. et al. Generalized Fibonacci Polynomials and Fibonomial Coefficients. Ann. Comb. 18, 541–562 (2014). https://doi.org/10.1007/s00026-014-0242-9
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DOI: https://doi.org/10.1007/s00026-014-0242-9
Keywords
- binomial theorem
- Catalan number
- Dodgson condensation
- Euler-Cassini identity
- Fibonacci number
- Fibonomial coefficient
- Lucas number q-analogue
- valuation