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- Relation between an element and a setSet membership is a relation between an element and a set. If x is an element of set B, it is written as x ∈ B, which can also be read as " x belongs to B ", or " x is in B "1. The statement " y is not an element of B " is written as y ∉ B, which can also be read as " y is not in B "1. Sets can also be related to each other through the subset relation. If all the members of set A are also members of set B, then A is a subset of B, denoted A ⊆ B2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Membership If B is a set and x is an element of B, this is written in shorthand as x ∈ B, which can also be read as " x belongs to B ", or " x is in B ". The statement " y is not an element of B " is written as y ∉ B, which can also be read as " y is not in B ".en.wikipedia.org/wiki/Set_(mathematics)Since sets are objects, 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.en.wikipedia.org/wiki/Set_theory
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The relation "is an element of", also called set membership, is denoted by the symbol "∈". Writing $${\displaystyle x\in A}$$ means that "x is an element of A". Equivalent expressions are "x is a member of A", "x belongs to A", "x is in A" and "x lies in A". The expressions "A includes x" and "A contains x" are … See more
In mathematics, an element (or member) of a set is any one of the distinct objects that belong to that set. See more
The number of elements in a particular set is a property known as cardinality; informally, this is the size of a set. In the above examples, the … See more
1889Giuseppe Peano introduces the symbol ∈ for set membership in his work Arithmetices principia, nova methodo exposita.1960Paul R. Halmos publishes Naive Set Theory, a widely used textbook on set theory.2002Thomas Jech publishes Set Theory, an article in the Stanford Encyclopedia of Philosophy, summarizing the main concepts and results of set theory.Using the sets defined above, namely A = {1, 2, 3, 4}, B = {1, 2, {3, 4}} and C = {red, green, blue}, the following statements are true:
• 2 … See more• Halmos, Paul R. (1974) [1960], Naive Set Theory, Undergraduate Texts in Mathematics (Hardcover ed.), NY: Springer-Verlag, See more
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Maybe it is not necessary to define set membership?
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