Mathematics – Functional Analysis
Scientific paper
2007-07-12
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.
Konjik Sanja
Kunzinger Michael
Oberguggenberger Michael
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