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Every set contains the empty set. Every set is a subset of itself.
Yes,an empty set is the subset of every set. The subset of an empty set is only an empty set itself.
Yes. One of the subsets is the set itself. The other is the null set.
The null set. Every set is a subset of itself and so the null set is a subset of the null set.
The ordinate and abscissa are equal for every point on the line [ y = x ].