Title:
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A new Lindelöf space with points $G_\delta$ (English) |
Author:
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Dow, Alan |
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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56 |
Issue:
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2 |
Year:
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2015 |
Pages:
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223-230 |
Summary lang:
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English |
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Category:
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math |
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Summary:
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We prove that $\diamondsuit^*$ implies there is a zero-dimensional Hausdorff Lindelöf space of cardinality $2^{\aleph_1}$ which has points $G_\delta$. In addition, this space has the property that it need not be Lindelöf after countably closed forcing. (English) |
Keyword:
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Lindelöf |
Keyword:
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forcing |
MSC:
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54A25 |
MSC:
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54D20 |
idZBL:
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Zbl 06433819 |
idMR:
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MR3338734 |
DOI:
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10.14712/1213-7243.2015.119 |
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Date available:
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2015-04-25T17:05:47Z |
Last updated:
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2017-08-07 |
Stable URL:
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http://hdl.handle.net/10338.dmlcz/144242 |
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Reference:
|
[1] Arhangel’skii A.V., Ponomarev, V.I.: Fundamentals of General Topology: Problems and Exercises.Reidel, Dordrecht, 1984. MR 0785749 |
Reference:
|
[2] Devlin K.J.: Constructibility.Perspectives in Mathematical Logic, Springer, Berlin, 1984; MR 750828 (85k:03001). Zbl 0542.03029, MR 0750828 |
Reference:
|
[3] Engelking R.: General Topology.translated from the Polish by the author, Monografie Matematyczne, Tom 60 [Mathematical Monographs, Vol. 60], PWN---Polish Scientific Publishers, Warsaw, 1977; MR 0500780 (58 \#18316b). Zbl 0684.54001, MR 0500780 |
Reference:
|
[4] Gorelic I.: The Baire category and forcing large Lindelöf spaces with points $G_\delta$.Proc. Amer. Math. Soc. 118 (1993), no. 2, 603–607; MR 1132417 (93g:03046). MR 1132417 |
Reference:
|
[5] Juhász I.: Cardinal functions. II.Handbook of Set-theoretic Topology, North-Holland, Amsterdam, 1984, pp. 63–109; MR 776621 (86j:54008). Zbl 0559.54004, MR 0776621 |
Reference:
|
[6] Juhász I.: Cardinal functions in topology---ten years later.second ed., Mathematical Centre Tracts, vol. 123, Mathematisch Centrum, Amsterdam, 1980; MR 576927 (82a:54002). Zbl 0479.54001, MR 0576927 |
Reference:
|
[7] Kanamori A.: The higher infinite. Large cardinals in set theory from their beginnings.second ed., Springer Monographs in Mathematics, Springer, Berlin, 2003; MR 1994835 (2004f:03092). Zbl 1154.03033, MR 1994835 |
Reference:
|
[8] Knight R.W.: A topological application of flat morasses.Fund. Math. 194 (2007), no. 1, 45–66; MR 2291716 (2008d:03048). Zbl 1126.03047, MR 2291716, 10.4064/fm194-1-3 |
Reference:
|
[9] Kunen K.: Set theory. An introduction to independence proofs.Studies in Logic and the Foundations of Mathematics, 102, North-Holland, Amsterdam-New York, 1980; MR 597342 (82f:03001). Zbl 0534.03026, MR 0597342 |
Reference:
|
[10] Tall F.D.: On the cardinality of Lindelöf spaces with points $G_\delta$.Topology Appl. 63 (1995), no. 1, 21–38; MR 1328616 (96i:54016). MR 1328616, 10.1016/0166-8641(95)90002-0 |
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