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CHARACTERISTICS OF SPACES WITH LOCALLY COUNTABLE CS-NETWORKS VIA IMAGES OF LOCALLY SEPARABLE METRIC SPACES
Corresponding Author(s) : Luong Quoc Tuyen
UED Journal of Social Sciences, Humanities and Education,
Vol. 7 No. 3 (2017): UED JOURNAL OF SOCIAL SCIENCES, HUMANITIES AND EDUCATION
Abstract
In [2], Tran Van An and Luong Quoc Tuyen proved that sn-symmetric spaces with countable cs-networks are equivalent with pseudo-sequence-covering compact images of separable metric spaces, equivalent with quotient-sequentially -images of separable metric spaces, and Cauchy sn-symmetric spaces with countable cs-networks are equivalent with 1-sequence-covering compact-covering compact images of separable metric spaces, equivalent with sequence-covering -images of a separable metric spaces. Besides, in [6, 7], Luong Quoc Tuyen proved that sn-symmetric spaces with locally countable cs-networks are equivalent with compact-covering compact ss-images of locally separable metric spaces, and Cauchy sn-symmetric spaces with locally countable cs-networks are equivalent with sequence-covering compact-covering compact ss-images of locally separable metric spaces. In this artcle, we prove that spaces with locally countable cs-networks are equivalent with sequence-covering compact-coveringss-images of locally separable metric spaces.
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[1] T. V. An and L. Q. Tuyen (2011). On an affirmative answer to S. Lin’s problem. Topology and its Applications, 158, 1567-1570.
[2] T. V. An and L. Q. Tuyen (2012). On -images of separable metric spaces and a problem of Shou Lin. Mat. Vesnik, 64 (4), 297-302.
[3] X. Ge (2007). Spaces with a locally countable sn-network. Lobachevskii J. Math., 26, 33-49.
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[5] M. Sakai(1997), “On spaces with a star-countable k-networks”, Houston J. Math.,23(1), 45-56.
[6] L. Q. Tuyen (2014). Some characterizations of spaces with locally countable networks. Mat. Vesnik, 66 (1), 84-90.
[7] L. Q. Tuyen (2013). A new characterization of spaces with locally countable sn-networks. Mat. Vesnik, 65 (1), 8-13.