I think the lessons that some of you wicked smart mathematics types have been doing (algebraic number theory, category theory) are awesome. It's great that you're willing to take your time to teach others. I understand that it takes time and effort, and I understand if your current threads take precedence, but there are a few things I wouldn't mind seeing lessons on, if any of you are up to it. For now I'm mainly interested in set theory, group theory, and maybe some basic topology stuff. I have high hopes of really getting into QM even without the schooling for it, and I know that I need to work on my mathematics basis for it. Good quality free resources (about the only type I can afford) aren't easy to come by, so it would be awesome if I could learn a bit here. Much thanks to anyone who steps up to the challenge.