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C_D

Last-modified: 2011-06-19 (日) 12:49:53

Definition Edit

  • A topological space (X,τ) is said to be C_D if for every x∈X, either {x}' is empty or {x}' is not closed.

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.