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Gδ space

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Mathematical analysis Fields of mathematical analysis Real analysis
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In the context of topology, a \( G_\delta \) space is a type of topological space that is defined using the concept of countable intersections of open sets. Specifically, a subset \( A \) of a topological space \( X \) is called a \( G_\delta \) set if it can be expressed as a countable intersection of open sets.

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