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Noun
1. set theoryMathematics
Wikipedia definition
2. Set theorySet theory is the branch of mathematics that studies sets, which are collections of objects. Although any type of object can be collected into a set, set theory is applied most often to objects that are relevant to mathematics. The language of set theory can be used in the definitions of nearly all mathematical objects. The modern study of set theory was initiated by Georg Cantor and Richard Dedekind in the 1870s.
Read “Set theory” on English Wikipedia
Read “集合論” on Japanese Wikipedia
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