When considering graduate school applications in mathematics or theoretical physics, having a strong foundation in mathematics is crucial. A major in theoretical physics, particularly one that includes significant math coursework, can qualify a student for math graduate programs, provided they meet the necessary prerequisites. Essential courses include group/ring/field theory, general topology, and analysis topics like complex variables and functional analysis. Historical examples, such as Edward Witten, illustrate that diverse academic backgrounds can lead to successful applications, emphasizing that meeting prerequisite requirements is more important than the specific major. For those still early in their undergraduate studies, focusing on building a solid math foundation is advisable rather than stressing over graduate school decisions prematurely.