I'm an undergraduate who finished up my junior year this past Spring. I've been looking around at grad schools for physics. However, I find myself about as unwilling to study physics in grad school and leave pure math behind, as I am unwilling to do things the other way around. Math so far has been just that fun, and indeed, I may have more of a natural knack for it than physics. (Since I wanted to contribute to the field of physics much more than I wanted to contribute to the field of math and since I find myself a tad more interested in physics than math, I figured it would be better to do physics in grad school) So far, it's been possible to just take the math classes at the math department (indeed, I've taken so much that I could be considered a mathematics major) or to self-study the math that's interested me most. Considering the increased difficulty of the physics and of the math in grad school, I'm not sure the same solution will work in grad school. I doubt my situation is unique. So my question for those who have been in a similar situation: How did you solve this problem? Did you actually take lots of math grad classes? Did you self-study in the math you were interested in? Did you wait to sort this out in grad school, hoping that you would lose your interest in one or the other enough to leave one behind? (e.g., it is possible one enjoyed undergrad math, but found grad math tedious) Or something else?