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The family of subset is closed under ____

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The family of subset is closed under ____

(a) equality

(b) equivalency

(c) union

(d) order

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I'm obligated to ask this question of Interface Technologies in section Software Defined Radio Architecture of Cognitive Radio

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The correct answer is (c) union

The best 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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