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I am currently taking the econ phd courses (Micro, Macro, Math for Econ). A solid understanding of basic real analysis is great, but a solid understanding of logic is absolutely essential. For example, you need to know how to work with quantifers: if you need to prove that for all x in R and all L>=1, f(Lx)<=Lf(x), how do you structure your proof? If you cannot answer this, then you have work to do before entering a phd program.
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