Concept

Development (topology)

Summary
In the mathematical field of topology, a development is a countable collection of open covers of a topological space that satisfies certain separation axioms. Let X be a topological space. A development for X is a countable collection F_1, F_2, \ldots of open coverings of X, such that for any closed subset C \subset X and any point p in the complement of C, there exists a cover F_j such that no element of F_j which contains p intersects C. A space with a development is called developable. A development F_1, F_2,\ldots such that F_{i+1}\subset F_i for all i is called a nested development. A theorem from Vickery states that every developable space in fact has a nested development. If F_{i+1} is a refinement of F_i, for all i, then the development is called a refined d
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