| Definition: | the complex quantity γ appearing in the equation:
a(t) = Aej(ωt - φ) - γx
where A and γ are in principle independent of x, where this expression may represent, along a line parallel to the axis Ox, a component a(t) of a sinusoidal electromagnetic field at angular frequency ω and initial phase φ, especially in the case of guided propagation by means of a cylindrical surface parallel to Ox, or for a uniform plane wave
NOTE – Compatible definitions are given in chapters 702 and 726.
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