Topic
Menger space.
topological space in which, for every sequence of open covers 𝑈₁, 𝑈₂, …, there are finite sets 𝐹₁⊂𝑈₁, 𝐹₂⊂𝑈₂, … such that 𝐹₁∪𝐹₂∪⋯ covers the space
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About Menger space
In mathematics, a Menger space is a topological space that satisfies a certain basic selection principle that generalizes σ-compactness. A Menger space is a space in which for every sequence of open covers of the space there are finite sets such that the family covers the space.
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