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Truncation-type methods and Bäcklund transformations for ordinary differential equations: the third and fifth Painlevé equations

Published online by Cambridge University Press:  19 July 2002

P. R. Gordoa
Affiliation:
Area de Fisica Teórica, Facultad de Ciencias, Edificio de Fisica, Universidad de Salamanca, 37008 Salamanca, Spain e-mail: prg@sonia.usal.es e-mail: andrew@sonia.usal.es
N. Joshi
Affiliation:
Department of Pure Mathematics, University of Adelaide, Adelaide, Australia 5005 e-mail: nalini.joshi@adelaide.edu.au
A. Pickering
Affiliation:
Area de Fisica Teórica, Facultad de Ciencias, Edificio de Fisica, Universidad de Salamanca, 37008 Salamanca, Spain e-mail: prg@sonia.usal.es e-mail: andrew@sonia.usal.es
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Abstract

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In a recent paper we presented a truncation-type method of deriving Bäcklund transformations for ordinary differential equations. This method is based on a consideration of truncation as a mapping that preserves the locations of a natural subset of the movable poles that the equation possesses. Here we apply this approach to the third and fifth Painlevé equations. For the third Painlevé equation we are able to obtain all fundamental Bäcklund transformations for the case where the parameters satisfy \gamma \delta \neq 0. For the fifth Painlevé equation our approach yields what appears to be all known Bäcklund transformations.

Type
Research Article
Copyright
© 2001 Glasgow Mathematical Journal Trust