Set theory is the study of sets in mathematics. Sets are collections of objects. We refer to these objects as "elements" or "members" of the set. To write a set, one wraps the numbers in {curly brackets}, and separates them with commas. For example. the set formula_1 holds 1, 2, and 3. Sets are also often referred to using capital roman letters such as formula_2, formula_3, formula_4.
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