Abstract
Conservation laws of the charge and of the energy are proved for nonlinear Schrödinger equations with nonlinearities of gauge invariance in a way independent of approximate solutions.
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Ozawa, T. Remarks on proofs of conservation laws for nonlinear Schrödinger equations. Calc. Var. 25, 403–408 (2006). https://doi.org/10.1007/s00526-005-0349-2
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DOI: https://doi.org/10.1007/s00526-005-0349-2