Something a little rough about this section was the Mobius inversion theorem. The symmetry of d,k was a little much for me. I could not completely understand how that worked or why. I need some more processing time on that one.
Something interesting was how multiplicative functions work. It seems to provide quite a bit of power in proving things when one knows that the function is multiplicative. Much more can be said about the function and the things it describes.
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