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arXiv · 2102.12062

Integrability of auto-B\"acklund transformations,and solutions of a torqued ABS equation

Xueli Wei·Peter H. van der Kamp·Da-jun Zhang
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Abstract

An auto-B\"acklund transformation for the quad equation $\mathrm{Q1}_1$ is considered as a discrete equation, called $\mathrm{H2}^a$, which is a so called torqued version of $\mathrm{H2}$. The equations $\mathrm{H2}^a$ and $\mathrm{Q1}_1$ compose a consistent cube, from which a auto-B\"acklund transformation and a Lax pair for $\mathrm{H2}^a$ are obtained. More generally it is shown that auto-B\"acklund transformations admit auto-B\"acklund transformations. Using the auto-B\"acklund transformation for $\mathrm{H2}^a$ we derive a seed solution and a one-soliton solution. From this solution it is seen that $\mathrm{H2}^a$ is a semi-autonomous lattice equation, as the spacing parameter $q$ depends on $m$ but it disappears from the plain wave factor.

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Xueli Wei, Peter H. van der Kamp, Da-jun Zhang. 2021-02-24. Integrability of auto-B\"acklund transformations,and solutions of a torqued ABS equation. https://doi.org/10.1088/1572-9494%2Fabfcba

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