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Energy invariant for shallow-water waves and the Korteweg–de Vries equation: Doubts about the invariance of energy

Energy invariant for shallow-water waves and the Korteweg–de Vries equation: Doubts about the invariance of energy

It is well known that the KdV equation has an infinite set of conserved quantities. The first three are often considered to represent mass, momentum and energy. Here we try to answer the question of how this comes about, and also how these KdV quantities relate to those of the …