Page "Naive set theory" Paragraph 7
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In naive set theory, a set is described as a well-defined collection of objects.
These objects are called the elements or members of the set.
Objects can be anything: numbers, people, other sets, etc.
For instance, 4 is a member of the set of all even integers.
Clearly, the set of even numbers is infinitely large ; there is no requirement that a set be finite.
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