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arXiv 0907.1798nlin.SI
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发展方程的非局部对称性

Nonlocal symmetries of evolution equations

Renat Zhdanov

摘要:

本文提出了对具有非平凡Lie对称性的发展方程进行群分类的方法。我们将这种方法应用于二阶发展方程在一个空间变量不变的李代数的维数高达3。其结果是,我们构建了广泛的家庭新的非线性发展方程具有非局部对称性,在原则上不能得到经典的李方法。

英文摘要:

We suggest the method for group classification of evolution equations admitting nonlocal symmetries which are associated with a given evolution equation possessing nontrivial Lie symmetry. We apply this method to second-order evolution equations in one spatial variable invariant under Lie algebras of the dimension up to three. As a result, we construct the broad families of new nonlinear evolution equations possessing nonlocal symmetries which in principle cannot be obtained within the classical Lie approach.

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