*Definition [#u3ba812b]
-A topological space (X, τ) is said to be a λ-R_0 space if every λ-open set contains the [[λ-closure]] of each of its singletons.

*Property [#z2b99d35]

*Reference [#v1d8c61a]
-Caldas Miguel, Jafari Saeid, ''On some low separation axioms via λ-open and λ-closure operator.'',  Rend. Circ. Mat. Palermo (2) 54 (2005), no. 2, 195–208.