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Reference.org
Element (mathematics)
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, an element (or member) of a <a href="/facts/Set_(mathematics)/BfucfHMq">set</a> is any one of the <a href="/facts/Equality_(mathematics)/AQCuumLg">distinct</a> <a href="/facts/Mathematical_object/Juhyow9M">objects</a> that belong to that set. For example, given a set called A containing the first four positive <a href="/facts/Integer/PUwwrawx">integers</a> ( A = { 1 , 2 , 3 , 4 } {\displaystyle A=\{1,2,3,4\}} ), one could say that "3 is an element of A", expressed notationally as 3 ∈ A {\displaystyle 3\in A} . </p>