Loterre: Mathematics: 3-manifold

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3-manifold

In mathematics, a 3-manifold is a topological space that locally looks like a three-dimensional Euclidean space. A 3-manifold can be thought of as a possible shape of the universe. Just as 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.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/3-manifold)

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