Abstract
By a simpler proof than was previously available (see, for example Rayleigh 1877, Lighthill 1960) it is shown that the mean energy flux velocity vector for a single infinite train of elliptically polarized harmonic small amplitude plane waves propagating in a homogeneous conservative, dispersive system is equal to the group velocity.
Reference2 articles.
1. On Progressive Waves
2. Lighthill M. J. i960 Phil. Trans. R. Soc. Lond. A 252 397-430.
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