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## Explination we found from Wikipedia for subset.

- in mathematics , especially in set theory , a set a is a subset of a set b, or equivalently b is a superset of a, if a is 'contained'
- if a is a subset of, but not equal to, b, then a is called a proper subset of b, written a ? b (a is a proper subset of b) or b ? a (b is a
- in topology and related areas of mathematics , a subspace of a topological space x is a subset s of x which is equipped with a topology
- in computer science , the subset sum problem is an important problem in complexity theory and cryptography . empty subset whose sum is zero?
- in topology and related areas of mathematics , a subset a of a topological space x is called dense (in x) if every point x in x either
- in the mathematical discipline of general topology , compactness is a property that generalizes the notion of a subset of euclidean space
- in mathematics , a cofinite subset of a set x is a subset a whose complement in x is a finite set. in other words, a contains all but
- in mathematics , a cocountable subset of a set x is a subset y whose complement in x is a countable set . a countable subset of the reals
- subset simulation is a method used in reliability engineering to compute small (i.e., rare event) failure probabilities encountered in
- totally bounded set , a subset that can be covered by finitely many subsets of fixed size.

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