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has been cited by the following article:

• TITLE: A Note on Kuratowski’s Theorem and Its Related Topics

  AUTHORS: K. P. Shum

  KEYWORDS: Kuratowski 14-Set, Kuratowski’s Theorem

  JOURNAL NAME: Advances in Pure Mathematics, Vol.7 No.8, August 3, 2017

  ABSTRACT: In point set topology, it is well known that the Kuratowski 14-set problem is one of the most interesting results. In this note, we first give a brief survey of the Kuratowski’s theorem. In particular, we will study and investigate the structure of the boundary of a given subset in a topological space. Some new results and topics which are related to the theorem of Kuratowski are presented and discussed. Finally, we pose some open problems of Kuratowskitype.