Department of Mathematics, Heze University, Shandong, China. and will be used to denote the sets of all strictly diagonally dominant matrices and the sets all Ostrowski matrices, respectively. is ...
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 ...
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