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The universal set is the set contain all objects or elements in a set
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Universal Set - the set containing all objects or elements and of which all other sets are subsets.
Universal Set-In set theory, a universal set is a set which contains all objects, including itself. In set theory as usually formulated, the conception of a universal set leads to a paradox (Russell's paradox) and is consequently not allowed. However, some non-standard variants of set theory include a universal set. It is often symbolized by the Greek letter xi.
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