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arXiv 0710.3053math-phmath.MP
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变系数扩散-对流方程的群分析。III。守恒律

Group Analysis of Variable Coefficient Diffusion--Convection Equations. III. Conservation Laws

N. M. Ivanova, R. O. Popovych, C. Sophocleous

摘要:

介绍并应用了微分方程组关于对称群和等价群的守恒律生成元的概念。这使我们能够推广本质上的程序寻找潜在的对称性的系统与多维空间的守恒律。研究了一类一般形式为$f(x)u_t=(g(x)A(u)u_x)_x+h(x)B(u)u_x$的变系数(1+1)维非线性扩散对流方程.使用最直接的方法,我们进行了两个分类的局部守恒律的等价关系产生的通常和增强的等价组。与$\hat G^{\sim}$的等价性和规范系数的正确选择对于最终结果的简单明了的表述起着主要作用。引入了守恒律压缩的概念和守恒律的一个特征,得到了对流扩散方程的守恒律压缩。

英文摘要:

The notions of generating sets of conservation laws of systems of differential equations with respect to symmetry groups and equivalence groups are introduced and applied. This allows us to generalize essentially the procedure of finding potential symmetries for the systems with multidimensional spaces of conservation laws. A class of variable coefficient (1+1)-dimensional nonlinear diffusion-convection equations of general form $f(x)u_t=(g(x)A(u)u_x)_x+h(x)B(u)u_x$ is investigated. Using the most direct method, we carry out two classifications of local conservation laws up to equivalence relations generated by both usual and enhanced equivalence groups. Equivalence with respect to $\hat G^{\sim}$ and correct choice of gauge coefficients of equations play the major role for simple and clear formulation of the final results. The notion of contractions of conservation laws and one of characteristics of conservation laws are introduced and contractions of conservation laws of diffusion-convection equations are found.

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