Title of article :
On Relative 1½-StarLindelöfness
Author/Authors :
Yan-Kui, Song Nanjing normal university - Department of Mathematics, China , Guang-Fa, Han Nanjing normal university - Department of Mathematics, China , Pi-Yu, Li Nanjing normal university - Department of Mathematics, China
From page :
183
To page :
186
Abstract :
A subspace Y of a space X is strongly 1½-starLindelöf in X if for every open cover U of X, there exists a countable subset ν of U such that V(intersection)Y≠Ф for each V Є ν and Y (subset of)(equal)St( Uν, U), where St( Uν, u) =U {U Є u : U(intersection)(union)ν≠Ф}. A subspace Y of a space X is 1½-starLindelöf in X if for every open cover u of X, there exists a countable subset νof u such that Y (subset of)(equal)St(Uν, u). In this paper, we give an example to show the difference between relative strongly 1½-starLindelöfness and relative 1½-starLindelöfness.
Keywords :
StarLindelöf , strongly 1½ , starLindelöf.
Journal title :
Bulletin of the Malaysian Mathematical Sciences Society
Journal title :
Bulletin of the Malaysian Mathematical Sciences Society
Record number :
2549708
Link To Document :
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