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Bispaces admitting only bicomplete or only totally bounded quasi-metrics. (English) Zbl 1007.54028

The authors extend the following result: a (pseudo) metrizable topological space admits only complete (pseudo) metrics if and only if it is compact. In section 2 the above result is studied for quasi-(pseudo) metrizable bispaces. An example shows that it is not true that quasi-metrizable bispaces \((X,S,T)\) admit only bicomplete quasi-metrics if and only if \((X, S\vee T)\) is compact. In section 3, the authors discuss the problem when quasi-pseudometrizable bispaces admit totally bounded quasi-pseudometrics.

MSC:

54E35 Metric spaces, metrizability
54E55 Bitopologies
54D30 Compactness
Full Text: DOI

References:

[1] Bourbaki N.,Algèbre Commutative, Hermann, (1961).
[2] Brümmer, G. C. L., Initial quasi-uniformities, Indag. Math., 31, 403-409 (1969) · Zbl 0183.27202
[3] Fell, J. M. G., A Hausdorff topology for the closed subsets of a locally compact non-Hausdorff space, Proc. Amer. Math. Soc., 13, 472-476 (1962) · Zbl 0106.15801 · doi:10.2307/2034964
[4] Fletcher P.—Lindgren W. F.,Quasi-Uniform Spaces, Marcel Dekker, (1982). · Zbl 0501.54018
[5] Hausdorff, F., Erweiterung einer Homöomorphie, Fund. Math., 16, 353-360 (1930) · JFM 56.0508.03
[6] Hoffmann, R.-E., On the sobrification remainder^sX/X, Pacific J. Math., 83, 145-156 (1979) · Zbl 0421.54018
[7] Junnila H. J. K.,Covering Properties and Quasi-Uniformities of Topological Spaces, Ph. D. Thesis, Blacksburg, Virginia, (1978).
[8] Kelly, J. C., Bitopological spaces, Proc. London Math. Soc., 13, 71-89 (1963) · Zbl 0107.16401 · doi:10.1112/plms/s3-13.1.71
[9] Künzi, H. P. A., On strongly quasi-metrizable spaces, Arch. Math. (Basel), 41, 57-63 (1983) · Zbl 0504.54028
[10] Künzi, H. P. A., Functorial admissible quasi-uniformities on topological spaces, Topology Appl., 43, 27-36 (1992) · Zbl 0748.54009 · doi:10.1016/0166-8641(92)90151-O
[11] Künzi, H. P. A.; Brümmer, G. C. L., Sobrification and bicompletion of totally bounded quasi-uniform spaces, Math. Proc. Cambridge Phil. Soc., 101, 237-247 (1987) · Zbl 0618.54024 · doi:10.1017/S0305004100066597
[12] Künzi, H. P. A.; Ferrario, N., Bicompleteness of the fine quasi-uniformity, Math. Proc. Cambridge Phil. Soc., 109, 167-186 (1991) · Zbl 0731.54021
[13] Künzi, H. P. A.; Mršević, M.; Reilly, I. L.; Vamanamurthy, M. K., Convergence, precompactness and symmetry in quasi-uniform spaces, Math. Japonica, 38, 239-253 (1993) · Zbl 0783.54022
[14] Künzi, H. P. A.; Romaguera, S.; Salbany, S., Topological spaces that admit bicomplete quasi-pseudometrics, Ann. Univ. Sci. Budapest, 37, 185-195 (1994) · Zbl 0823.54025
[15] Lindgren, W. F., Topological spaces with a unique compatible quasi-uniformity, Canad. Math. Bull., 14, 369-372 (1971) · Zbl 0218.54017
[16] Romaguera, S.; Salbany, S., On bicomplete quasi-pseudometrizability, Topology Appl., 50, 283-289 (1993) · Zbl 0827.54020 · doi:10.1016/0166-8641(93)90026-A
[17] Romaguera S.—Salbany S.,Dieudonné complete bispaces, Studia Sci. Math. Hungar., to appear. · Zbl 0980.54023
[18] Salbany, S.; Romaguera, S., On countably compact quasi-pseudometrizable spaces, J. Austral. Math. Soc. (Series A), 49, 231-240 (1990) · Zbl 0706.54027
[19] Skula, L., On a reflective subcategory of the category of all topological spaces, Trans. Amer. Math. Soc., 142, 37-41 (1969) · Zbl 0185.50401 · doi:10.2307/1995343
[20] Stone, A. H., Hereditarily compact spaces, Amer. J. Math., 82, 900-916 (1960) · Zbl 0099.17302 · doi:10.2307/2372948
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