Abstract
We introduce the notion of πg-closed sets and use it to obtain a characterization and preservation theorems of quasi-normal spaces.
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Dontchev, J., Noiri, T. Quasi-Normal Spaces and πg-Closed Sets. Acta Mathematica Hungarica 89, 211–219 (2000). https://doi.org/10.1023/A:1010607824929
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DOI: https://doi.org/10.1023/A:1010607824929