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• W2413019875 abstract "We study nearest-neighbors walks on the two-dimensional square lattice, that is, models of walks on $mathbb{Z}^2$ defined by a fixed step set that is a subset of the non-zero vectors with coordinates 0, 1 or $-1$. We concern ourselves with the enumeration of such walks starting at the origin and constrained to remain in the quarter plane $mathbb{N}^2$, counted by their length and by the position of their ending point. Bousquet-Melou and Mishna [Contemp. Math., pp. 1--39, Amer. Math. Soc., 2010] identified 19 models of walks that possess a D-finite generating function; linear differential equations have then been guessed in these cases by Bostan and Kauers [FPSAC 2009, Discrete Math. Theor. Comput. Sci. Proc., pp. 201--215, 2009]. We give here the first proof that these equations are indeed satisfied by the corresponding generating functions. As a first corollary, we prove that all these 19 generating functions can be expressed in terms of Gauss' hypergeometric functions that are intimately related to elliptic integrals. As a second corollary, we show that all the 19 generating functions are transcendental, and that among their $19 times 4$ combinatorially meaningful specializations only four are algebraic functions." @default.
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• W2413019875 date "2016-06-09" @default.
• W2413019875 modified "2023-09-26" @default.
• W2413019875 title "Hypergeometric Expressions for Generating Functions of Walks with Small Steps in the Quarter Plane" @default.
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