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η-open

Last-modified: 2011-11-17 (木) 18:51:40

Definition Edit

  • A subset S of a topological space (X,τ) is called η-open if S is the union of a δ-closed sets.

Property Edit

  • Every η-open set is ∨-set?.

Reference Edit

  • Dontchev, J.; Popvassilev, S.; Stavrova, D., On the η-expansion topology for the co-semi-regularization and mildly Hausdorff spaces., (English summary), Acta Math. Hungar. 80 (1998), no. 1-2, 9-19.