Article ID Journal Published Year Pages File Type
4657778 Topology and its Applications 2016 5 Pages PDF
Abstract
Corollary 2If a locally compact σ-compact normal space X is the union of an increasing sequence of open sets U1⊂U2⊂U3⊂… such that each Un contracts to a point in X, then X is contractible.
Keywords
Related Topics
Physical Sciences and Engineering Mathematics Geometry and Topology
Preview
Is a monotone union of contractible open sets contractible?
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