Title:
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On spaces with point-countable $k$-systems (English) |
Author:
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Yoshioka, Iwao |
Language:
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English |
Journal:
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Commentationes Mathematicae Universitatis Carolinae |
ISSN:
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0010-2628 (print) |
ISSN:
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1213-7243 (online) |
Volume:
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45 |
Issue:
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4 |
Year:
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2004 |
Pages:
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749-765 |
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Category:
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math |
. |
Summary:
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This paper deals with the behavior of $M$-spaces, countably bi-quasi-$k$-spaces and singly bi-quasi-$k$-spaces with point-countable $k$-systems. For example, we show that every $M$-space with a point-countable $k$-system is locally compact paracompact, and every separable singly bi-quasi-$k$-space with a point-countable $k$-system has a countable $k$-system. Also, we consider equivalent relations among spaces entried in Table 1 in Michael's paper [15] when the spaces have point-countable $k$-systems. (English) |
Keyword:
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countably-bi-quasi-$k$-space |
Keyword:
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point-countable $k$-system |
Keyword:
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local compactness |
Keyword:
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\newline metrizability |
MSC:
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54D55 |
MSC:
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54E18 |
MSC:
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54E35 |
idZBL:
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Zbl 1099.54025 |
idMR:
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MR2103090 |
. |
Date available:
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2009-05-05T16:48:59Z |
Last updated:
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2012-04-30 |
Stable URL:
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http://hdl.handle.net/10338.dmlcz/119500 |
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Reference:
|
[1] Arhangel'skii A.V.: Factor mappings of metric spaces.Soviet Math. Dokl. 5 (1965), 368-371. |
Reference:
|
[2] Arhangel'skii A.V.: On a class of spaces containing all metric spaces and all locally bicompact spaces.Amer. Math. Soc. Transl. 92 (1970), 1-39. |
Reference:
|
[3] Burke D.K.: On p-spaces and $w\Delta$-spaces.Pacific J. Math. 35 (1972), 285-296. MR 0278255 |
Reference:
|
[4] Burke D.K.: Covering properties.Chapter 9, in Handbook of Set Theoretic Topology; K. Kunen and J.E. Vaughan, Eds., North Holland, Amsterdam, 1984. Zbl 0569.54022, MR 0776628 |
Reference:
|
[5] Burke D.K., Michael E.: On certain point-countable covers.Pacific J. Math. 64 (1976), 79-92. Zbl 0341.54022, MR 0467687 |
Reference:
|
[6] Ceder J.G.: Some generalizations of metric spaces.Pacific J. Math. 11 (1961), 105-125. Zbl 0103.39101, MR 0131860 |
Reference:
|
[7] Engelking R.: General Topology.Polish Sci. Publ., Warszawa, 1977. Zbl 0684.54001, MR 0500780 |
Reference:
|
[8] Franklin S.P.: Spaces in which sequences suffice II.Fund. Math. 61 (1967), 51-56. Zbl 0168.43502, MR 0222832 |
Reference:
|
[9] Gillman L., Jerison M.: Rings of Continuous Functions.D. Van Nostrand, Princeton, N.J., 1960. Zbl 0327.46040, MR 0116199 |
Reference:
|
[10] Gruenhage G., Michael E., Tanaka Y.: Spaces determined by point-countable covers.Pacific J. Math. 113 (1984), 303-332. Zbl 0561.54016, MR 0749538 |
Reference:
|
[11] Heath R.W.: On open mappings and certain spaces satisfying the first countability axiom.Fund. Math. 57 (1965), 91-96. Zbl 0134.41802, MR 0179763 |
Reference:
|
[12] Li J., Lin S.: $k_{ømega}$-spaces and Y. Tanaka's question.Acta Math. Hungar. 100 (2003), 321-323. |
Reference:
|
[13] Martin H.W.: Remarks on the Nagata-Smirnov metrization theorem.Topology Proceedings of the Memphis State Univ. Conference, edited by S.P. Franklin and B.V. Smith Thomas, Lecture Note in Pure and Applied Math. 24, pp.217-224, Dekker, 1976. Zbl 0353.54018, MR 0433401 |
Reference:
|
[14] Michael E.: $\aleph_{0}$-spaces.J. Math. Mech. 15 (1966), 983-1002. MR 0206907 |
Reference:
|
[15] Michael E.: A quintuple quotient quest.General Topology Appl. 2 (1972), 91-138. Zbl 0238.54009, MR 0309045 |
Reference:
|
[16] O'Mera P.: On paracompactness in function spaces with the compact-open topology.Proc. Amer. Math. Soc. 29 (1971), 183-189. MR 0276919 |
Reference:
|
[17] Stone A.H.: Metrizability of unions of spaces.Proc. Amer. Math. Soc. 10 (1959), 361-366. MR 0105672 |
Reference:
|
[18] Tanaka Y.: On open finite-to-one maps.Bull. Tokyo Gakugei Univ. Ser. IV 25 (1973), 1-13. Zbl 0355.54008, MR 0346730 |
Reference:
|
[19] Tanaka Y.: Some necessary conditions for products of $k$-spaces.Bull. Tokyo Gakugei Univ. Ser. IV 30 (1978), 1-16. Zbl 0427.54016, MR 0512222 |
Reference:
|
[20] Tanaka Y.: Point-countable $k$-systems and products of $k$-spaces.Pacific J. Math. 101 (1982), 199-208. Zbl 0498.54023, MR 0671852 |
Reference:
|
[21] Tanaka Y.: Metrizability of certain point-countable unions.Sci. Math. Jpn. 57 (2003), 201-206. Zbl 1032.54017, MR 1959977 |
Reference:
|
[22] Tanaka Y.: Products of $k$-spaces, and questions.Comment. Math. Univ. Carolinae 44 (2003), 335-345. Zbl 1100.54006, MR 2026168 |
Reference:
|
[23] Tanaka Y., Zhoh Hao-xuan: Spaces determined by metric subsets, and their character.Questions Answers Gen. Topology 3 (1985/86), 145-160. MR 0826985 |
Reference:
|
[24] Yoshioka I.: On the metrizability of $\gamma$-spaces and $ks$-spaces.Questions Answers Gen. Topology 19 (2001), 55-72. MR 1815346 |
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