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  1. en.wikipedia.org › wiki › Set_theorySet theory - Wikipedia

    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.

  2. 8 de oct. de 2014 · Set theory is the mathematical theory of well-determined collections, called sets, of objects that are called members, or elements, of the set. Pure set theory deals exclusively with sets, so the only sets under consideration are those whose members are also sets.

  3. Algebra of sets. In mathematics, the algebra of sets, not to be confused with the mathematical structure of an algebra of sets, defines the properties and laws of sets, the set-theoretic operations of union, intersection, and complementation and the relations of set equality and set inclusion.

  4. Sets are well-determined collections that are completely characterized by their elements. Thus, two sets are equal if and only if they have exactly the same elements. The basic relation in set theory is that of elementhood, or membership. We write \ (a\in A\) to indicate that the object \ (a\) is an element, or a member, of the set \ (A\).

  5. Set theory is a branch of mathematics that studies sets, which are essentially collections of objects. For example \ {1,2,3\} {1,2,3} is a set, and so is \ {\heartsuit, \spadesuit\} {♡,♠}.