If you express a wave as a Fourier series like:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]z(x,t)= \sum _{n=1} ^{ inf.} A_n cos(nk_0 x - \omega (n) t )[/tex]

Then what is the physical interpretation of a non-zero imaginary part of a component amplitude?

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# Imaginary FS components

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