Author： Garg L. Singh Navpreet
Publisher： Springer Publishing Company
ISSN： 0236-5294
Source： Acta Mathematica Hungarica, Vol.105, Iss.4, 2004-01, pp. : 331-337
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Abstract
We obtain (a) necessary and sufficient conditions and (b) sufficient conditions for a compact (countably compact) set to be closed in products (sequential products) and subspaces (sequential subspaces) of normal spaces. As a consequence of these, sufficient conditions are obtained for (i) the closedness of arbitrary (countable) union of closed sets and (ii) the equality of the union of the closures and the closure of the union of arbitrary (countable) families of sets in these spaces. It is also shown that these results do not hold for quotients of even
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