Introduction to Real Analysis
Really Analysis is actually much better than I thought it would be. I recommend reading the textbook in advance before every class. Also, get ready for some tough exams.
This is one of those required math classes for the math major. It's not too bad - you really just go in depth on proving all the things you learned in Calculus. It's now called Intro to Analysis. I recommend taking 401 (or 501) before you take this one. You will be expected to come in with very polished proof writing skills.