Finite Unions of D-Spaces and Applications of Nearly Good Relation

نویسندگان

  • Xin Zhang
  • Hongfeng Guo
  • Yuming Xu
  • Fuyi Xu
چکیده

Some results are obtained on finite unions ofD-spaces. It is proved that if a space is the union of finitely many locally compact Dsubspaces, then it is aD-space. It follows that a space is aD-space if it is the union of finitely many locally compact submetacompact subspaces. And a space is a D-space if it is the union of a D-subspace with a locally compact D-subspace. This partially answers one problem raised by Arhangel’skii. At last, some examples are given to exhibit the applications of nearly good relation to discover D-classes.

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تاریخ انتشار 2014