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3. Topological spaces
In mathematics, a space is a set E equipped with an additional structure (p. 7 of ); for example, an algebraic or topological structure. An element of E is then called a point (point) of the space.
3.1 Topological spaces
Definition (topological space, axioms for open sets). A topological...
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Topological spaces
Sequences of points and subsets
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