25 July 2002 Generalization of group velocity and group acceleration
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Group velocity is typically defined as the derivative of the dispersion relation. However, we show that definition is not appropriate in general and is only applicable to wave equations with constant coefficients. We generalize the concept of group velocity and also show that in general one also has group acceleration. Explicit expressions are derived and examples are given.
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Leon Cohen, Leon Cohen, } "Generalization of group velocity and group acceleration", Proc. SPIE 4726, Automatic Target Recognition XII, (25 July 2002); doi: 10.1117/12.477013; https://doi.org/10.1117/12.477013

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