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arXiv 1003.1648math-phmath.APmath.MPnlin.SI
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发展方程的守恒律和标准形

Conservation laws and normal forms of evolution equations

Roman O. Popovych, Artur Sergyeyev

摘要:

研究了两个独立变量的发展方程的局部守恒律。特别是,我们提出了正规形式的方程承认一个或两个低阶守恒律。例子包括Harry Dym方程、Korteweg-de-Vries型方程和Schwarzian KdV方程。它还表明,线性发展方程的所有守恒律(模平凡守恒向量)在因变量及其导数最多二次。

英文摘要:

We study local conservation laws for evolution equations in two independent variables. In particular, we present normal forms for the equations admitting one or two low-order conservation laws. Examples include Harry Dym equation, Korteweg-de-Vries-type equations, and Schwarzian KdV equation. It is also shown that for linear evolution equations all their conservation laws are (modulo trivial conserved vectors) at most quadratic in the dependent variable and its derivatives.

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