Uniform covers at non-isolated points

Details Uniform covers at non-isolated points Uniform covers at non-isolated points

2011-06-21

arxiv.org/abs/1106.4133v1

Topology proceedings, 32(2008), 259-275

Mathematics

General Topology

12 pages

Scientific paper

In this paper,\ the authors define a space with an uniform base at non-isolated points, give some characterizations of images of metric spaces by boundary-compact maps, and study certain relationship among spaces with special base properties.\ The main results are the following: (1)\ $X$ is an open,\ boundary-compact image of a metric space if and only if $X$ has an uniform base at non-isolated points; (2)\ Each discretizable space of a space with an uniform base is an open compact and at most boundary-one image of a space with an uniform base; (3)\ $X$ has a point-countable base if and only if $X$ is a bi-quotient,\ at most boundary-one and countable-to-one image of a metric space.

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