Hello PhysicsForums I'm an undergraduate physics major trying to get an idea of what I'm going to be spending the rest of my life doing. I know that physicists are usually split into theorists and experimentalists with the majority being experimentalists. But are the two types always separate? For example, how unusual would it be for an experimentalist in condensed matter to contribute to the development of theories in his/her field through mathematics rather than experimentation? Thank you.