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arXiv 2004.03743math-phmath.MP
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由偏微分方程的非变分对称性求对称递归算子的一个公式

A formula for symmetry recursion operators from non-variational symmetries of partial differential equations

Stephen C. Anco, Bao Wang

摘要:

利用变分积分因子和非变分对称性的新结果,得到了求解偏微分方程对称性递推算子的显式公式。该公式是由非梯度伴随对称产生预辛算子的一般公式的特例。这些公式的线性偏微分方程和可积的非线性偏微分方程的几个例子说明。此外,通过第一个公式,准线性二阶偏微分方程允许一个乘法对称递归算子的分类。

英文摘要:

An explicit formula to find symmetry recursion operators for partial differential equations (PDEs) is obtained from new results connecting variational integrating factors and non-variational symmetries. The formula is special case of a general formula that produces a pre-symplectic operator from a non-gradient adjoint-symmetry. These formulas are illustrated by several examples of linear PDEs and integrable nonlinear PDEs. Additionally, a classification of quasilinear second-order PDEs admitting a multiplicative symmetry recursion operator through the first formula is presented.

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