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## Main Question or Discussion Point

I didn't put this in any of the physics sections, because I'm only learning this as it pertains to complex analysis. This was just an example provided in a free complex analysis textbook. Basically what I'm asking is why for the law of gravitation, f = GMm/r(t)^2, and it equals the equation in the picture when described by complex functions.

http://i.minus.com/iblXBR9aafGTaZ.png [Broken]

http://i.minus.com/iblXBR9aafGTaZ.png [Broken]

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