Previous |  Up |  Next

Article

Title: A note on condensations of $C_p(X)$ onto compacta (English)
Author: Arhangel'skii, A. V.
Author: Pavlov, O. I.
Language: English
Journal: Commentationes Mathematicae Universitatis Carolinae
ISSN: 0010-2628 (print)
ISSN: 1213-7243 (online)
Volume: 43
Issue: 3
Year: 2002
Pages: 485-492
.
Category: math
.
Summary: A condensation is a one-to-one continuous mapping onto. It is shown that the space $C_p(X)$ of real-valued continuous functions on $X$ in the topology of pointwise convergence very often cannot be condensed onto a compact Hausdorff space. In particular, this is so for any non-metrizable Eberlein compactum $X$ (Theorem 19). However, there exists a non-metrizable compactum $X$ such that $C_p(X)$ condenses onto a metrizable compactum (Theorem 10). Several curious open problems are formulated. (English)
Keyword: condensation
Keyword: compactum
Keyword: network
Keyword: Lindelöf space
Keyword: topology of pointwise convergence
Keyword: $\sigma $-compact space
Keyword: Eberlein compactum
Keyword: Corson compactum
Keyword: Borel set
Keyword: monolithic space
Keyword: tightness
MSC: 54A25
MSC: 54A35
MSC: 54C35
MSC: 54D30
idZBL: Zbl 1090.54003
idMR: MR1920523
.
Date available: 2009-01-08T19:24:06Z
Last updated: 2012-04-30
Stable URL: http://hdl.handle.net/10338.dmlcz/119337
.
Reference: [1] Arhangelskii A.V.: Continuous maps, factorization theorems, and function spaces.Trans. Moscow Math. Soc. 47 (1985), 1-22.
Reference: [2] Arhangelskii A.V.: Topological Function Spaces.Kluwer Academic Publishers, Dordrecht, 1992, p. 205. MR 1144519
Reference: [3] Arhangelskii A.V.: $C_p$-theory.pp.1-56 in: M. Hu\u sek and J. van Mill, Eds, Recent Progress in General Topology, North-Holland, Amsterdam-London-New-York, 1992, 796 pp.
Reference: [4] Arhangelskii A.V.: On condensations of $C_p$-spaces onto compacta.Proc. Amer. Math. Soc. 128 (2000), 1881-1883. MR 1751998
Reference: [5] Arhangelskii A.V., Ponomarev V.I.: Fundamentals of General Topology in Problems and Exercises.D. Reidel Publ. Co., Dordrecht-Boston, Mass., 1984. MR 0785749
Reference: [6] Banach S.: Livre Ecossais.Problem 1, 17:8, 1935; Colloq. Math. 1 (1947), p.150.
Reference: [7] Dobrowolski T., Marciszewski W.: Classification of function spaces with the topology determined by a countable dense set.Fund. Math. 148 (1995), 35-62. MR 1354937
Reference: [8] Godefroy G.: Compacts de Rosenthal.Pacific J. Math. 91 (1980), 293-306. Zbl 0475.46003, MR 0615679
Reference: [9] Juhasz I.: Cardinal functions in topology.Math. Centre Tracts 34, Amsterdam, 1971. Zbl 0479.54001, MR 0340021
Reference: [10] Marciszewski W.: A function space $C_p(X)$ without a condensation onto a $\sigma $-compact space.submitted, 2001. Zbl 1019.54012
Reference: [11] Marciszewski W.: On a classification of pointwise compact sets of the first Baire class functions.Fund. Math. 133 (1989), 195-209. Zbl 0719.54022, MR 1065902
Reference: [12] Pytkeev E.G.: Upper bounds of topologies.Math. Notes 20:4 (1976), 831-837. MR 0428237
Reference: [13] Tkachenko M.G.: Bicompacta that are continuous images of sets everywhere dense in the product of spaces.Bull. Acad. Polon. Sci. Ser. Sci. Math. 27:10 (1979), 797-802. MR 0603151
Reference: [14] Tkachenko M.G.: On continuous images of spaces of functions.Siberian Math. J. 26:5 (1985), 159-167. MR 0808711
Reference: [15] Tkachenko M.G.: Factorization theorems for topological groups and their applications.Topology Appl. 38 (1991), 21-37. Zbl 0722.54039, MR 1093863
Reference: [16] Tkachenko M.G.: On continuous images of dense subspaces of topological products.Uspekhi Mat. Nauk 34:6 (1979), 199-202. MR 0562841
.

Files

Files Size Format View
CommentatMathUnivCarolRetro_43-2002-3_8.pdf 211.0Kb application/pdf View/Open
Back to standard record
Partner of
EuDML logo