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Powers of a matrix and combinatorial identities (1812.11279v1)
Published 29 Dec 2018 in math.CO
Abstract: In this article we obtain a general polynomial identity in $k$ variables, where $k\geq 2$ is an arbitrary positive integer. We use this identity to give a closed-form expression for the entries of the powers of a $k \times k$ matrix. Finally, we use these results to derive various combinatorial identities.