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set theory - wikipedia set theory from wikipedia, the free encyclopedia jump to navigation jump to search this article is about the branch of mathematics. for other uses, see set theory (disambiguation) . branch of mathematics that studies sets a venn diagram illustrating the intersection of two sets
, the membership relation can relate sets as well. a derived binary relation between two sets is the subset relation, also called set inclusion. if all the members of set a are also members of set b, then a is a subset of b, denoted a ⊆ b. for example, { , } is a subset of { , , } , and so is { } but...
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