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## Homework Statement

Hi

In Griffiths (chapter 9) he states that any wave can be expressed as a linear combination of sinusoidal waves,

[tex]

f(z,t)=\int_{-\infty}^{\infty}{A(k)e^{i(kz-\omega t)}dk} = e^{-i\omega t}\int_{-\infty}^{\infty}{A(k)e^{ikz}dk}

[/tex]

Is it correct to say that this in principle is a complex Fourier series?