Acta Mathematica Hungarica

, Volume 89, Issue 3, pp 211-219

First online:

Quasi-Normal Spaces and πg-Closed Sets

  • J. DontchevAffiliated withDepartment of Mathematics, University of Helsinki
  • , T. NoiriAffiliated withDepartment of Mathematics, Yatsushiro College of Technology

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We introduce the notion of πg-closed sets and use it to obtain a characterization and preservation theorems of quasi-normal spaces.