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... A topological space X is compact if every open cover of X has a finite S subcover, i.e. if whenever X = i∈I Ui , for a collection of open sets {Ui | i ∈ I} then we S also have X = i∈F Ui , for some finite subset F of I. (3.2a) Proposition ...
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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.
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