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Topology: The Meaning of Symbols

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What is this symbol and what does it mean? See attachment.

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Solution Summary

This explains a given symbol. The expert examines topology.

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Please see attachment

means union of an arbitrary number. Please see following.

Properties of open sets
1. The union (of an arbitrary number) of open sets is open.
Let x Ai = A. Then s Ai for some i. Since ...

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