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Characterizations of Compact Metric Spaces

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Ann. Funct. Anal. 5 (2014), no. 2, 1–29

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The sequence selection properties of Cp(X)

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On the Level Spaces of Fuzzy Topological Spaces

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Open Covers and Symmetric Operators

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3-manifold



In mathematics, a 3-manifold is a space that locally looks like Euclidean 3-dimensional space. Intuitively, a 3-manifold can be thought of as a possible shape of the universe. Just like a sphere looks like a plane to a small enough observer, all 3-manifolds look like our universe does to a small enough observer. This is made more precise in the definition below.