Summary
Lagrangian systems in explicitly covariant form are treated as systems of conservation laws with constrained field variables and a physical example like nonlinear covariant electrodynamics is examined.
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References
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Strumia, A. Wave propagation and symmetric hyperbolic systems of conservation laws with constrained field variables. III.—Lagrangian systems 0263. Nuov Cim B 106, 773–779 (1991). https://doi.org/10.1007/BF02722545
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DOI: https://doi.org/10.1007/BF02722545