Throughout the remainder of the book we shall be primarily concerned with fields possessing a simple harmonic time dependence. Since the time dependence of all fields and currents must be the same, it is useful to suppress the common time factor with the aid of complex notation. We shall write the real quantity A(t) as
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© 2006 Springer
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Milton, K.A., Schwinger, J. (2006). Variational Principles for Harmonic Time Dependence. In: Electromagnetic Radiation: Variational Methods, Waveguides and Accelerators. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-29306-X_4
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DOI: https://doi.org/10.1007/3-540-29306-X_4
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