Abstract
We study a relationship between regular flat structures and generalized Okubo systems. We show that the space of variables of isomonodromic deformations of a regular generalized Okubo system can be equipped with a flat structure. As its consequence, we introduce flat structures on the spaces of independent variables of generic solutions to (classical) Painleve equations (except for PI). In our framework, the Painleve equations PVI–PII can be treated uniformly as just one system of differential equations called the four-dimensional extended WDVV equation. Then the well-known coalescence cascade of the Painleve equations corresponds to the degeneration scheme of the Jordan normal forms of a square matrix of rank four.
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