I've done some research on the internet and on various platforms (Coursera, Udacity, ...) but I've found it very hard to find free online lectures in math past the level of introductory calculus/linear algebra. I know MIT has some resources but does anyone have gold mines they'd be willing to share?
I'm specifically looking for fundamentals like real and complex analysis, abstract algebra, topology, set theory, logic etc.
Thanks in advance!