Abstract
Wave propagation is often described by hyperbolic systems of partial differential equations. When such systems are not linear, it is frequently impossible to obtain the analytical form of the characteristic curves of these systems. The author shows that the equations governing the transient electrical conduction in solids constitute a fair example of a quasilinear system where the characteristics describing the propagating wavefronts of electrons and holes can be obtained straightforwardly. This example also exhibits the role of the characteristics as transporters of discontinuities in the partial derivatives of the dependent variables.
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