How important is a measure theory course as an undergrad? I have to choose between taking an undergrad measure theory course and doing research. I'm already doing another research project, but I figure no grad school is going to penalize me for doing too much research. But how "bad" is it that I'm not taking a Measure Theory course? There is no way I can do measure theory and the research, it would put me at 6 courses which is just way too much for me given all the other nonacademic things I have to deal with. I have taken an analysis course which did all the basics: sequences, series, derivative, all the way up to the Riemann integral. I have also taken a complex analysis course.