What is Ext(A) equal to?
- Int(A°)
- X
- Int(A)
- None
Explanation
Ext(A) represents the exterior of set A, which is the set of all points in the universal set X that are not in the closure of A (denoted by A°).
The interior of the closure of A (Int(A°)) consists of all points in A° that are not boundary points.
Since the exterior of A consists of all points in X that are not in A°, Ext(A) is equal to Int(A°).
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