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arXiv 0910.4439nlin.SI
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$(A_2+A_1)^{(1)}$型离散Painlevé系统的投影约化

Projective reduction of the discrete Painlevé system of type $(A_2+A_1)^{(1)}$

Kenji Kajiwara, Nobutaka Nakazono, Teruhisa Tsuda

摘要:

我们考虑由$(A_2 + A_1)^{(1)}$型仿射Weyl群的双有理表示所产生的q-Painlevé III方程。从仿射Weyl群对称性的角度研究了q-Painlevé III方程到q-Painlevé II方程的约化.特别是,这两个方程的超几何解之间的明显不一致的机制,澄清了通过使用差分算子和$τ$函数的因式分解。

英文摘要:

We consider the q-Painlevé III equation arising from the birational representation of the affine Weyl group of type $(A_2 + A_1)^{(1)}$. We study the reduction of the q-Painlevé III equation to the q-Painlevé II equation from the viewpoint of affine Weyl group symmetry. In particular, the mechanism of apparent inconsistency between the hypergeometric solutions to both equations is clarified by using factorization of difference operators and the $τ$ functions.

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