So, I'm reading Penrose's "The Road To Reality". I got stuck in chapter 7 that has to do with complex number calculus. A quick google search returned this: http://www.math.gatech.edu/~cain/winter99/complex.html
I plan on getting through that (or part of it) before returning to Penrose's book. I need some good math books recommendations to get me through the first 17 chapters though. I don't really know where else I'll have to put Penrose's book down and learn something new so any recommendations from someone who read Penrose's book would be helpful. My goal is to just get through this whole book and understand everything in it.