Question

The family of subset is closed under ____

a.

equality

b.

equivalency

c.

union

d.

order

Answer: (c).union Explanation:The topological space includes a set X and a family of subsets. The subsets include the set X itself as well as an empty set. The family of subset is closed under union and finite intersection.

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Q. The family of subset is closed under ____

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