*Definition [#u95c12d7]
-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 [#v373f7c9]
-R_Y ⇒ [[R_{UD}]].
-R_Y + [[T_0]] = [[T_Y]]


*Reference [#naca4cfd]
-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.