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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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    https://brainmass.com/math/geometry-and-topology/topology-meaning-symbols-3231

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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.
    Proof
    Let x Ai = A. Then s Ai for some i. Since ...

    Solution Summary

    This explains a given symbol. The expert examines topology.

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