Gδ space
= Gδ space
{wiki=Gδ_space}
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.