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On the Lagrange variational problem

Volume 130 / 2023

Veronika Chrastinová, Václav Tryhuk Annales Polonici Mathematici 130 (2023), 149-180 MSC: Primary 49-01; Secondary 49K15, 35Q31, 58A17, 58E30. DOI: 10.4064/ap220330-30-1 Published online: 20 March 2023

Abstract

We investigate the stationarity of variational integrals evaluated on solutions of a system of differential equations. First, the fundamental concepts are relieved of accidental structures and of hypothetical assumptions. The differential constraints, stationarity and the Euler–Lagrange equations related to Poincaré–Cartan forms do not require any reference to coordinates or deep existence theorems for boundary value problems. Then, by using the jet formalism, the Lagrange multiplier rule is proved for all higher-order variational integrals and arbitrary compatible systems of differential equations. The self-contained exposition is based on the standard theory of differential forms and vector fields.

Authors

  • Veronika ChrastinováInstitute of Mathematics and Descriptive Geometry
    Faculty of Civil Engineering
    Brno University of Technology
    602 00 Brno, Czech Republic
    e-mail
  • Václav TryhukInstitute of Mathematics and Descriptive Geometry
    Faculty of Civil Engineering
    Brno University of Technology
    602 00 Brno, Czech Republic
    e-mail

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