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Group analysis of differential equations and generalized functions | | Michael Kunzinger
; Michael Oberguggenberger
; | | Date: |
28 Dec 1999 | | Journal: | SIAM J. Math. Anal. 31 (2000) no. 6, 1192-1213. | | Subject: | Functional Analysis; Analysis of PDEs MSC-class: 46F30; 35Dxx; 35A30; 58G35 | math.FA math.AP | | Abstract: | We present an extension of the methods of classical Lie group analysis of differential equations to equations involving generalized functions (in particular: distributions). A suitable framework for such a generalization is provided by Colombeau’s theory of algebras of generalized functions. We show that under some mild conditions on the differential equations, symmetries of classical solutions remain symmetries for generalized solutions. Moreover, we introduce a generalization of the infinitesimal methods of group analysis that allows to compute symmetries of linear and nonlinear differential equations containing generalized function terms. Thereby, the group generators and group actions may be given by generalized functions themselves. | | Source: | arXiv, math.FA/9912217 | | Services: | Forum | Review | PDF | Favorites | |
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