So I'm going into my physics major in the fall, and I'm very excited. I've been doing some serious catch up with math, and I'm realizing that I do truly enjoy the math part. Anyways, I had always thought of going into a theoretical physics type career (easier said than done, I know) but now I'm wondering if I should be focusing more on math for that. That is, I'm almost certain I will want to finish my physics major for my bachelors, but I'm wondering past that. Should I try and take more math classes while going for my bachelors? and should I toy with the idea of going into a mathematics masters or Ph.D? I'm asking simply because I truly don't know where the line is between where math ends, and physics begins. So I'm not 100% sure what I'm asking.. let me put it this way: I like the effectiveness of the application of math that physics offers, that is why I'm going into it. I want to be working on theoretical physics ideally (but that is simply because I'm not aware of anything else that is so intensive math wise) or possibly string/m theory (again I have limited knowledge at the moment). So should I be focusing more on math, or more on physics? I appreciate any help, I'm sure someone will be able to funnel this into a discussion, I just believe it's my lack of knowledge of the boundaries of each field that are causing me the most confusion. Thanks : D EDIT: also, would what I'm talking about be in the vecinity of Applied MAthematics? or am I mixing up the meaning?