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• 1 Kamaraj College Department of Mathematics Thoothukudi, Tamil Nadu India
• | 2 M.S. University Department of Mathematics Tirunelveli, Tamil Nadu India
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## Abstract

Characterizations and properties of
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-closed sets and
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-open sets are given. A characterization of normal spaces is given in terms of
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-open sets. Also, it is established that an
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-closed subset of an
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-compact space is
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-compact.

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Acta Mathematica Hungarica
Language English
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1950
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