What math courses are essential before beginning an economic PhD program? Which ones are recommended but not essential?

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What math courses are essential before beginning an economic PhD program? Which ones are recommended but not essential?

You can check the answer of the people under the question at Quora “coffee recipes with torani syrup“

As far as I can remember, the bare minimum requirements are typical calculus sequence, statistics and probability, linear algebra, and maybe even differential equation. However, the key course is really any course on proof writing, i.e. real analysis, topology etc. In general, the more mathematical analysis you study the better you are prepared for the program.