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I have already, or will have already taken the standard core mathematics courses: i.e. calculus, linear algebra, ordinary and partial differential equations, complex analysis, and real analysis. However, I have some choice when it comes to which upper year math courses I can take, and so I was wondering what particular topics would be the best preparation for graduate school.

Specifically, I can make the choice between abstract algebra (rings, fields, Galois theory etc.), differential geometry, number theory, further studies in real and complex analysis (I'm not quite sure what this would entail; possibly lots of measure theory), Green's functions and the calculus of variations, and probability.

The choices aren't mutually exclusive, in general; however, if I I choose to focus on abstract algebra, due to unfortunate scheduling conflicts, and prerequisites, I will be unable to take any of the differential geometry or analysis courses. Although, I will be taking an introductory General Relativity course regardless, so I suspect that even if I don't take the differential geometry courses I would get at least a brief introduction to the subject, even if an unsatisfactory one.