If anyone here is knowledgeable about the said subjects, I would really appreciate some help. Specifically, I'd like a rigorous tutoring in complex analysis, Fourier transformation, and tensor calculus, and help with practice problems. I am doing a lot of work on my own, so at most I expect this might take several hours over the course of several days.
I'm having a great deal of difficulty because I'm a foreign exchange student in Germany. I'm not fluent and my previous education doesn't fit into their system at all. I've also found that most of the resources online are fantastically bad at explaining these things to people who do not already know what they are.
If anyone is interested in taking some time to answer very technical questions, I'd appreciate it. I know people usually get paid for this sort of thing, and this isn't probably the best place to look for help. I'm not going to put the questions here because there are several and they are very long, although I think maybe this would be a good place to start a general discussion on these topics if anyone is interested.