Foundations of the calculus of variations in generalized function algebras

Details Foundations of the calculus of variations in generalized function algebras Foundations of the calculus of variations in generalized function algebras

2007-07-12

arxiv.org/abs/0707.1842v1

Acta Appl. Math. 103: 169-199, 2008.

Mathematics

Functional Analysis

Scientific paper

We propose the use of algebras of generalized functions for the analysis of certain highly singular problems in the calculus of variations. After a general study of extremal problems on open subsets of Euclidean space in this setting we introduce the first and second variation of a variational problem. We then derive necessary (Euler-Lagrange equations) and sufficient conditions for extremals. The concept of association is used to obtain connections to a distributional description of singular variational problems. We study variational symmetries and derive an appropriate version of N\"other's theorem. Finally, a number of applications to geometry, mechanics, elastostatics and elastodynamics are presented.

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