Using complex numbers to represent waves – physics.stackexchange.com

Using complex numbers to represent waves – physics.stackexchange.com

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When talking about a plane wave of the form $$\vec E=\vec E_0\cos(\vec k \cdot \vec r-\omega t)$$ We can replace it by $$\vec E=\vec E_0\exp[i(\vec k \cdot \vec r-\omega t)]$$ so that it is easier for ...

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