Normal space

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Notion

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Science and technology

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What Wikipedia says

In topology and related branches of mathematics, a normal space is a topological space in which any two disjoint closed sets have disjoint open neighborhoods. Such spaces need not be Hausdorff in general. A normal Hausdorff space is called a T4 space.

Excerpt from the Wikipedia article “Normal space”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fibonacci, Copyrighted free use, via Wikimedia Commons.