Available in electronic format
Available in print format
Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826 (e) ISSN 0002-9939 (p)
     

Characterizations of paracompact-like properties by means of set-valued semi-continuous selections

Author(s): Kazumi Miyazaki
Journal: Proc. Amer. Math. Soc. 129 (2001), 2777-2782.
MSC (2000): Primary 54B20, 54C65
Posted: April 24, 2001
Retrieve article in: PDF
This article is available free of charge

Abstract | References | Similar articles | Additional information

Abstract:

We give a characterization of countably paracompact and collectionwise normal spaces by means of set-valued semi-continuous selections. This provides a positive answer to a problem of V. Gutev.


References:

1.
J. Chaber, M. Choban and K. Nagami, On monotone generalizations of Moore spaces, Cech-complete spaces and p-spaces, Fund. Math. 84 (1974), 107-119. MR 49:7988

2.
M. Choban, Many-valued mappings and Borel sets I, II, Trans. Moscow Math. Soc. 22,23 (1970), 258-280, 286-310. MR 51:9016

3.
M. Choban and S. Nedev, Factorization theorems for set-valued mappings, set-valued selections and topological dimension, Mat. Balkanica 4 (1974), 457-460 (in Russian). MR 52:9165

4.
C. H. Dowker, Homotopy extension theorems, Proc. London. Math. Soc. 6 (1956), 100-116. MR 17:518f

5.
R. Engelking, General Topology, Heldermann, Berlin, revised ed. 1989. MR 91c:54001

6.
M. K. Fort, Jr., A unified theory of semi-continuity, Duke Math. J. 16 (1949), 237-246. MR 10:716f

7.
V. Gutev, Generic extensions of finite-valued u.s.c. selections, Topology and Appl. 104 (2000), 101-118. CMP 2001:01

8.
-, Weak factorizations of continuous set-valued mappings, Topology and Appl. 102 (2000), 33-51. MR 2000j:54017

9.
-, Selections of set-valued mappings and hyperspace topologies, (unpublished).

10.
V. Gutev and T. Nogura, Selections for Vietoris-like hyperspace topologies, Proc. London Math. Soc. 80 (2000), 235-256. MR 2000j:54013

11.
E. Michael, Topologies on spaces of subsets, Trans. Amer. Math. Soc. 71 (1951), 152-182. MR 13:54f

12.
-, A thorem on semi-continuous set-valued functions, Duke. Math. J. 26 (1959), 647-656. MR 22:229

13.
-, Continuous selection I, Ann. Math. 63 (1956), 361-382. MR 17:990e

14.
-, Complete spaces and tri-quotient maps, Illinois J. Math. 21 (1977), 716-733. MR 57:7543

15.
S. Nedev, Selection and factorization theorems for set-valued mappings, Serdica 6 (1980), 291-317. MR 83c:54023


Similar Articles:

Retrieve articles in Proceedings of the American Mathematical Society with MSC (2000): 54B20, 54C65

Retrieve articles in all Journals with MSC (2000): 54B20, 54C65


Additional Information:

Kazumi Miyazaki
Affiliation: Department of Mathematical Sciences, Faculty of Sciences, Ehime University, Matsuyama 790-8577, Japan
Email: BZQ22206@nifty.ne.jp

DOI: 10.1090/S0002-9939-01-06204-9
PII: S 0002-9939(01)06204-9
Keywords: Hyperspace, selection, semi-continuous
Received by editor(s): May 12, 1999
Received by editor(s) in revised form: December 12, 1999
Posted: April 24, 2001
Communicated by: Alan Dow
Copyright of article: Copyright 2001, American Mathematical Society


  AMS Website Logo Small Comments: webmaster@ams.org
© Copyright 2009, American Mathematical Society
Privacy Statement
Search the AMSPowered by Google