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Last-modified: 2013-04-19 (金) 13:11:14

Definition Edit

  • A topological space (X,τ) is said to be R*_{UD} if for every x∈X, either {x}' is the union of disjoint closed sets or {x}' does not contain a non-empty closed sed.

Property Edit

Reference Edit

  • Guia, Josep, Essentially T_D and essentially T_UD spaces., Bull. Math. Soc. Sci. Math. R. S. Roumanie (N.S.) 32(80) (1988), no. 3, 227-233.