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Topology sets and functions

Topology
Sets and Functions (IV)
The Algebra of Sets

If { Ai } and { Bj } are two classes of sets such that { Ai } is subset of { Bj },
show that Ui Ai is subset Uj Bj and ∩j Bj is subset of ∩i Ai.

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Solution Summary

This is a topology proof regarding sets and subsets.

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