2006 年 58 巻 4 号 p. 529-548
We find and study a two-parameter family of coupled Painlevé II systems in dimension four, which can be obtained by a degeneration from the systems of type $A_4^{(1)}$. These systems are compared with other types of coupled Painlevé II systems from the viewpoint of the local index. We also give the phase spaces for these systems.
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