Methods of constructing conservation laws. The classical Noether's theorem in constructing conservation laws can only be applied, if a Lagrangian function is available for the system of interest. By using the recently developed Neutral Action Method, this requirement can be dropped, since a given set of governing partial differential equations is sufficient to construct conservation laws. But even if a Lagrangian function is available, the NA-method delivers the same results as Noether's method, if, in addition, the Bessel-Hagen extension would be applied.
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