Connected economically metrizable spaces

Details Connected economically metrizable spaces Connected economically metrizable spaces

2009-01-02

arxiv.org/abs/0901.0236v4

Fund. Math. 212 (2011), 145-173

Mathematics

General Topology

20 pages

Scientific paper

A topological space is nonseparably connected if it is connected but all of its connected separable subspaces are singletons. We show that each connected sequential topological space X is the image of a nonseparably connected complete metric space Eco(X) under a monotone quotient map. The metric d of the space Eco(X) is economical in the sense that for each infinite subspace A of X the cardinality of the set {d(a,b):a,b in A} does not exceed the density of A. The construction of the space Eco(X) determines a functor Eco from the category Top of topological spaces and their continuous maps into the category Metr of metric spaces and their non-expanding maps.

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