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Set theory

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Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory — as a branch of mathematics — is mostly concerned with those that are relevant to mathematics as a whole.

Georg Cantor

Richard Dedekind

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Julius Wilhelm Richard Dedekind was a German mathematician who made important contributions to number theory, abstract algebra, and
the axiomatic foundations of arithmetic. His best known contribution is the definition of real numbers through the notion of Dedekind cut. He is also considered a pioneer in the development of modern set theory and of the philosophy of mathematics known as Logicism.

Richard Dedekind

Dedekind, before 1886