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HallsofIvy

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How is logic up there with category theory?

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I suppose I'd put logic up there because while you use e.g. set theory and category theory to study mathematical structures, logic can be used to study both of these theories (set theory is a branch of logic). Model theory is another branch which studies structures in a similiar way to universal algebra. To me the study of different types of logic purely for their own sake is as abstruse as studying categories. Just my opinion though.

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