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I majored in mathematics a couple decades ago, and after working as a programmer in the meantime, am coming back round to math.
I came across this course through a tweet, I think, and have some catching up to do. In the meantime I am proofreading the heck of the textbook. : - )
Right now I'm quite interested in number theory, but happy to have the chance to learn any new math in a relatively structured way.