Enumerative combinatorics
Computational Discrete Mathematics
Laurent biorthogonal polynomials, q-Narayana polynomials and domino tilings of the Aztec diamonds
Journal of Combinatorial Theory Series A
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In this article we look at one such marvelous piece of mathematical reasoning, the Lemma of Gessel and Viennot which has become an instant classic in combinatorial enumeration since its appearance in 1985. A similar version which was largely overlooked was previously obtained by Lindström.