Is my ODE a Painleve equation in disguise?

Details Is my ODE a Painleve equation in disguise? Is my ODE a Painleve equation in disguise?

2001-05-08

arxiv.org/abs/nlin/0105016v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

8 pages. Based on talks presented at NEEDS 2000, Gokova, Turkey, 29 June - 7 July, 2000, and at the AMS-HKMS joint meeting 13-

Scientific paper

Painleve equations belong to the class y'' + a_1 {y'}^3 + 3 a_2 {y'}^2 + 3 a_3 y' + a_4 = 0, where a_i=a_i(x,y). This class of equations is invariant under the general point transformation x=Phi(X,Y), y=Psi(X,Y) and it is therefore very difficult to find out whether two equations in this class are related. We describe R. Liouville's theory of invariants that can be used to construct invariant characteristic expressions (syzygies), and in particular present such a characterization for Painleve equations I-IV.

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