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Tran Van An, Luong Quoc Tuyen (2008)
Commentationes Mathematicae Universitatis Carolinae
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Some relationships between -sequence-covering maps and weak-open maps or sequence-covering -maps are discussed. These results are used to generalize a result from Lin S., Yan P., , Topology Appl. (2001), 301–314.
Li, Zhaowen (2005)
International Journal of Mathematics and Mathematical Sciences
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Rastislav Telgársky (1976)
Colloquium Mathematicae
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Karol Borsuk, Rimas Vaina (1979)
Colloquium Mathematicae
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G. J. Michaelides (1981)
Colloquium Mathematicae
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Shou Lin, Peng Fei Yan (2003)
Commentationes Mathematicae Universitatis Carolinae
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The main purpose of this paper is to establish general conditions under which -spaces are compact-covering images of metric spaces by using the concept of -covers. We generalize a series of results on compact-covering open images and sequence-covering quotient images of metric spaces, and correct some mapping characterizations of -metrizable spaces by compact-covering -maps and -maps.