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C_R の変更点


 *Definition [#laec839f]
 -A topological space (X,τ) is said to be C_R if for every x∈X, {x}' does not contain a non-empty closed set.
 
 *Proposition [#fb2f8a80]
 -A topological space (X,τ) is C_r iff it is a [[R_0]] space.
 -A topological space (X,τ) is C_R iff it is a [[R_0]] space.
 
 *Reference [#c40bd4b2]
 -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.