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arXiv 1005.2071nlin.SI
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阶梯法:可积格点方程周期约化的积分

The staircase method: integrals for periodic reductions of integrable lattice equations

Peter H. van der Kamp, G. R. W. Quispel

摘要:

我们表明,在充分的一般性,阶梯方法提供积分映射,和对应关系,获得行波减少(系统)可积偏差分方程。我们将阶梯方法应用于各种方程,包括Korteweg-De Vries方程,五点的K-Calogero-Droghei方程,QD算法和Boussinesq系统。我们证明了,在所有这些情况下,如果阶梯方法提供了一个n维映射的r个积分,其中2 r <n,那么可以引入q<= 2 r个变量,从而将映射的维数从n降到q。这些降维变量作为映射的k-对称的联合不变量而获得。我们的结果支持的想法,往往楼梯方法提供了足够多的积分周期约化的可积格方程是完全可积的。我们还研究了减少其他四图比常规的二维格,我们证明了线性增长的高维对应的迭代作为减少QD算法的多值性。

英文摘要:

We show, in full generality, that the staircase method provides integrals for mappings, and correspondences, obtained as traveling wave reductions of (systems of) integrable partial difference equations. We apply the staircase method to a variety of equations, including the Korteweg-De Vries equation, the five-point Bruschi-Calogero-Droghei equation, the QD-algorithm, and the Boussinesq system. We show that, in all these cases, if the staircase method provides r integrals for an n-dimensional mapping, with 2r<n, then one can introduce q<= 2r variables, which reduce the dimension of the mapping from n to q. These dimension-reducing variables are obtained as joint invariants of k-symmetries of the mappings. Our results support the idea that often the staircase method provides sufficiently many integrals for the periodic reductions of integrable lattice equations to be completely integrable. We also study reductions on other quad-graphs than the regular 2D lattice, and we prove linear growth of the multi-valuedness of iterates of high-dimensional correspondences obtained as reductions of the QD-algorithm.

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