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Bäcklund transformations for integrable lattice equations

James Atkinson

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We give new Bäcklund transformations (BTs) for some known integrable (in the sense of being multidimensionally consistent) quadrilateral lattice equations. As opposed to the natural auto-BT inherent in every such equation, these BTs are of two other kinds. Specifically, it is found that some equations admit additional auto-BTs (with Bäcklund parameter), whilst some pairs of apparently distinct equations admit a BT which connects them.


PACS

02.30.Ik Integrable systems

MSC

37K35 Lie-Bäcklund and other transformations

37K10 Completely integrable systems, integrability tests, bi-Hamiltonian structures, hierarchies (KdV, KP, Toda, etc.)

Subjects

Mathematical physics

Dates

Issue 13 (4 April 2008)

Received 14 January 2008, in final form 21 February 2008

Published 14 March 2008



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