arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv math-ph/0005013math-phmath.MP
收藏

李代数的结构与偏微分方程的分类问题

The Structure of Lie Algebras and the Classification Problem for Partial Differential Equations

P. Basarab-Horwath, V. Lahno, R. Zhdanov

摘要:

本文完全解决了\ $u_{t}=F(t,x,u,u_{x})u_{xx} + G(t,x,u,u_{x})$形式的非线性导热方程的群分类问题。我们已经证明,特别是,上述类不包含非线性方程的不变代数维数超过5。此外,我们还证明了分别有2个、34个、35个和6个不等式允许一维、二维、三维、四维和五维李代数存在。由于我们使用的程序,在很大程度上依赖于理论的抽象李代数的低维,我们给一个详细的说明必要的事实。这些材料分散在文献中,没有完整的英文本。在代数部分之后,我们给出了详细的描述方法,然后我们推导了不等价的不变发展方程的形式,并计算了相应的极大对称代数。以这种方式获得的不变方程列表包含(直到变量的局部变化)所有先前已知的属于所研究的偏微分方程类的不变演化方程。

英文摘要:

The present paper solves completely the problem of the group classification of nonlinear heat-conductivity equations of the form\ $u_{t}=F(t,x,u,u_{x})u_{xx} + G(t,x,u,u_{x})$. We have proved, in particular, that the above class contains no nonlinear equations whose invariance algebra has dimension more than five. Furthermore, we have proved that there are two, thirty-four, thirty-five, and six inequivalent equations admitting one-, two-, three-, four- and five-dimensional Lie algebras, respectively. Since the procedure which we use, relies heavily upon the theory of abstract Lie algebras of low dimension, we give a detailed account of the necessary facts. This material is dispersed in the literature and is not fully available in English. After this algebraic part we give a detailed description of the method and then we derive the forms of inequivalent invariant evolution equations, and compute the corresponding maximal symmetry algebras. The list of invariant equations obtained in this way contains (up to a local change of variables) all the previously-known invariant evolution equations belonging to the class of partial differential equations under study.

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。

↑