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The Padé interpolation method applied to $q$-Painlevé equations II (differential grid version)

Recently we studied Padé interpolation problems of $q$-grid, related to $q$-Painlevé equations of type $E_7^{(1)}$, $E_6^{(1)}$, $D_5^{(1)}$, $A_4^{(1)}$ and $(A_2+A_1)^{(1)}$. By solving those problems, we could derive evolution equations, scalar Lax pairs and determinant formulae of special solutions for the corresponding $q$-Painlevé equations. It is natural that the $q$-Painlevé equations were derived by the interpolation method of $q$-grid, but it may be interesting in terms of differential grid that the Padé interpolation method of differential grid (i.e. Padé approximation method) has been applied to the $q$-Painlevé equation of type $D_5^{(1)}$ by Y. Ikawa. In this paper we continue the above study and apply the Padé approximation method to the $q$-Painlevé equations of type $E_6^{(1)}$, $D_5^{(1)}$, $A_4^{(1)}$ and $(A_2+A_1)^{(1)}$. Moreover determinant formulae of the special solutions for $q$-Painlevé equation of type $E_6^{(1)}$ are given in terms of the terminating $q$-Appell Lauricella function.

preprint2016arXivOpen access

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