Local cohomology of generalized Okamoto-Painlevé pairs and Painlevé equations

Details Local cohomology of generalized Okamoto-Painlevé pairs and Painlevé equations Local cohomology of generalized Okamoto-Painlevé pairs and Painlevé equations

2000-06-05

arxiv.org/abs/math/0006027v1

Mathematics

Algebraic Geometry

22 pages

Scientific paper

In the theory of deformation of Okamoto-Painlev\'e pair (S,Y), a local cohomology group $H^1_D(\Theta_S(-\log D))$ plays an important role. In this paper, we estimate the local cohomology group of pair (S,Y) for several types, and obtain the following results. For a pair (S,Y) corresponding to the space of initial conditions of the Painlev\'e equations, we show that the local cohomology group $H^1_D(\Theta_S(-\log D))$ is at least 1 dimensional. This fact is the key to understand Painlev\'e equation related to (S,Y). Moreover we show that, for the pairs (S,Y) of type $\tilde{A_8}$, the local cohomology group $H^1_D(\Theta_S(-\log D))$ vanish. Therefore in this case, there is no differential equation on S-Y in the sense of the theory.

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