D.H Road, Sarisha WestBengal743368, India
Department of Physics, Diamond Harbour Women's Uni
Guha P., Choudhury A. G., Khanra B., Leach P.
Nonlocal Constants of Motions of Equations of Painlevé – Gambier Type and Generalized Sundman Transformation
2022, Vol. 18, no. 1, pp. 103-118
We describe a method to generate nonlocal constants of motion for a special class of nonlinear ODEs. We employ the method of the generalized Sundman transformation to obtain certain new nonlocal first integrals of autonomous second-order ordinary differential equations belonging to the classification scheme developed by Painlevé and Gambier.
Guha P., Garai S., Choudhury A. G.
Lax Pairs and First Integrals for Autonomous and Non-Autonomous Differential Equations Belonging to the Painlevé – Gambier List
2020, Vol. 16, no. 4, pp. 637-650
Recently Sinelshchikov et al.  formulated a Lax representation for a family of nonautonomous second-order differential equations. In this paper we extend their result and obtain the Lax pair and the associated first integral of a non-autonomous version of the Levinson – Smith equation. In addition, we have obtained Lax pairs and first integrals for several equations of the Painlevé – Gambier list, namely, the autonomous equations numbered XII, XVII, XVIII, XIX, XXI, XXII, XXIII, XXIX, XXXII, XXXVII, XLI, XLIII, as well as the non-autonomous equations Nos. XV and XVI in Ince’s book.