Around Katětov's metrization theorem
Heikki J. K. Junnila (1988)
Commentationes Mathematicae Universitatis Carolinae
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Displaying similar documents to “The union of two D-spaces need not be D”
Around Katětov's metrization theorem
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Aleksander V. Arhangel'skii (1988)
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The Lindelöf number greater than continuum is u-invariant
Arbit, A. V. (2011)
Serdica Mathematical Journal
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2000 Mathematics Subject Classification: 54C35, 54D20, 54C60. Two Tychonoff spaces X and Y are said to be l-equivalent (u-equivalent) if Cp(X) and Cp(Y) are linearly (uniformly) homeomorphic. N. V. Velichko proved that countable Lindelöf number is preserved by the relation of l-equivalence. A. Bouziad strengthened this result and proved that any Lindelöf number is preserved by the relation of l-equivalence. In this paper it has been proved that the Lindelöf number greater...