What is Negative Frequency?

Explains the concept of negative frequency that is often plotted in Fourier Transforms.

One point to note is that I have used "j" for the complex variable, instead of "i" (which is more commonly used). This is because I am an electrical engineer, and we use "i" for electrical current, so we use "j" for the complex variable to avoid confusing ourselves (... except then of course it can be confusing for physicists and mathematicians! ... sorry about that, but it is just the way it is.)

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