= Gerald Beresford Whitham
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Gerald Beresford Whitham developed an averaged <variational principle> for slowly varying dispersive <waves>. The method averages a <Lagrangian> over a rapid wave cycle and derives equations for the slower evolution of the wave parameters. It supplies a common framework for linear and nonlinear wave modulation instead of treating every wave train as a separate perturbation calculation.<A general approach to linear and non-linear dispersive waves using a Lagrangian by Gerald Beresford Whitham>[Publisher abstract]{ref}
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