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arXiv 2005.06738nlin.SI
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一类二维可积格方程

On a class of 2D integrable lattice equations

E. V. Ferapontov, I. T. Habibullin, M. N. Kuznetsova, V. S. Novikov

摘要:

本文发展了一种新的方法来分类$$ u_{xy}=f(u, u_x, u_y, \triangle_z u \triangle_{\bar z}u, \triangle_{z\bar z}u), $$形式的可积方程,其中$\triangle_{ z}$和$\triangle_{\bar z}$是前向/后向离散导数。(1)首先要求方程的无色散极限是可积的,即方程的特征簇定义了一个共形结构,该共形结构在每个解上都是Einstein-Weyl。(2)其次,在前一步中选择的候选方程,我们应用达布可积性的测试通过施加适当的截止条件获得的减少。

英文摘要:

We develop a new approach to the classification of integrable equations of the form $$ u_{xy}=f(u, u_x, u_y, \triangle_z u \triangle_{\bar z}u, \triangle_{z\bar z}u), $$ where $\triangle_{ z}$ and $\triangle_{\bar z}$ are the forward/backward discrete derivatives. The following 2-step classification procedure is proposed: (1) First we require that the dispersionless limit of the equation is integrable, that is, its characteristic variety defines a conformal structure which is Einstein-Weyl on every solution. (2) Secondly, to the candidate equations selected at the previous step we apply the test of Darboux integrability of reductions obtained by imposing suitable cut-off conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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