difinition of empty set
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It isn't. The empty set is a subset - but not a proper subset - of the empty set.
null
The complement of an empty set is universal set
An 'Empty Set' or a 'Nul Set'.
The power set of the empty has one member, which is the set whose member is the empty set . {phi} ( Actually the symbol for the empty set is the Norwegian letter O which resembles the Greek letter phi but is a different symbol )