Singular normal form for the Painlevé equation P1

Details Singular normal form for the Painlevé equation P1 Singular normal form for the Painlevé equation P1

1997-10-27

arxiv.org/abs/math/9710209v1

Mathematics

Classical Analysis and ODEs

Scientific paper

10.1088/0951-7715/11/5/002

We show that there exists a rational change of coordinates of Painlev\'e's P1 equation $y''=6y^2+x$ and of the elliptic equation $y''=6y^2$ after which these two equations become analytically equivalent in a region in the complex phase space where $y$ and $y'$ are unbounded. The region of equivalence comprises all singularities of solutions of P1 (i.e. outside the region of equivalence, solutions are analytic). The Painlev\'e property of P1 (that the only movable singularities are poles) follows as a corollary. Conversely, we argue that the Painlev\'e property is crucial in reducing P1, in a singular regime, to an equation integrable by quadratures.

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