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TOPOLOGICAL SPACES GENERATED BY DISCRETE SUBSPACES

Authors: Ergashova Sh.R.;

TOPOLOGICAL SPACES GENERATED BY DISCRETE SUBSPACES

Abstract

In [3] the authors initiated a systematic study of the property of a space to be generated by its discrete subsets. Discretely generated properties seems to be interesting in themselves due to their good categorical behaviour: discrete generability is hereditary; each compact space of countable tightness is discretely generated; FrechetUrysohn is discretely generated. Such a property turns out to be not only interesting, but also the base for many nice questions. Discrete generability has surprising relationships with classical properties. According to the article [1] sequential spaces is generated by discrete sets, but in this work we will show an example which sequential space is not discrete generated space. A lot of properties are preserved by making product. The product of Hausdorff spaces is a Hausdorff space, the product of compacts is a compact, the countable product of metrizable spaces is metrizable. However it is not case of the discrete generability. We will show a simple counter-example. Additionally, the product of Frechet-Urysohn spaces are not discretely generated space was shown by example.

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Keywords

Discretely generated space; Frechet-Urysohn space; sequential space

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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