Hey all, I'm looking for some help in selecting courses for the spring. I'm a sophomore physics major, hoping to pursue a PhD after graduation. Although I'm not sure what subfield I'll want to be in, odds are it'll be something theoretical. So far I've taken Intro Physics I and II, Calc I-III, and Advanced Classical Mechanics. I've self-studied and picked up differential equations and linear algebra enough to be effective in my courses. For the spring, I'm definitely taking Quantum Mechanics I and proof-based Linear Algebra. I'm wondering what other math I should consider taking. My options include are Intro to Analysis, Ordinary Differential Equations, Partial Differential Equations, and Algebraic Topology. What would you guys recommend? I know this is a somewhat subjective question, but I'm just looking for some opinions. Thanks!