On a Dense Gd-diagonal
A. V. Arhangel'skii, Ljubiša Kočinac (1990)
Publications de l'Institut Mathématique
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A. V. Arhangel'skii, Ljubiša Kočinac (1990)
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Teodor Przymusiński (1980)
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Jack Ceder (1969)
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K. Alster (1981)
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The class of -spaces is studied in detail. It includes, in particular, all Čech-complete spaces, Lindelöf -spaces, metrizable spaces with the weight , but countable non-metrizable spaces and some metrizable spaces are not in it. It is shown that -spaces are in a duality with Lindelöf -spaces: is an -space if and only if some (every) remainder of in a compactification is a Lindelöf -space [Arhangel’skii A.V., Remainders of metrizable and close to metrizable spaces, Fund. Math....
Garg, G.L., Goel, Asha (1995)
International Journal of Mathematics and Mathematical Sciences
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