R_Y

Definition

• A topological space (X,τ) is said to be an R_YS-space if for all x and y in X, cl{x}≠cl{y} ⇒ cl{x}∩cl{y} is degenerate.

Property

• R_Y ⇒ R_{UD}.
• R_Y + T_0 = T_Y

Reference

• Misra, D. N.; Dube, K. K., Some axioms weaker than the R0-axiom., (Serbo-Croatian summary), Glasnik Mat. Ser. III 8(28) (1973), 145–148.