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A superset is the opposite of a subset in the sense that if S is a subset of T then T is a superset of S. T is superset of S if every element, x, that belongs to S also belongs to T.
The immediate [next] superset is, trivially, the set of natural numbers which consists of the counting numbers and zero. The next significant superset is the set of integers: the counting numbers, their additive inverses (or negatives) and zero.
No. Natural numbers are the same set or a superset. The answer depends on whether 0 is excluded or included in natural numbers.
It is a decimal representation of a negative rational number. It also belongs to any superset that contains the set of negative rational numbers.
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.