*Definition [#s312dff6]

*Property [#j6cc7a80]
-A space (X,τ) is T_{1/2} space if and only if it is a [[β*T_{1/2}]] and [[β**T_{1/2}>β**T_{1/2}]][2]
-T_{1/2} ⇒ [[λ-T_{1/2}]]. [4]


*Reference [#ze37b7f0]
+.
+Açıkgöz, Ahu, ''On β∗g-closed sets and new separation axioms.'' (English summary), Eur. J. Pure Appl. Math. 4 (2011), no. 1, 20–33.
+Caldas Miguel, Jafari Saeid, Navalagi Govindappa, ''More on λ-closed sets in topological spaces.'',Rev. Colombiana Mat. 41 (2007), no. 2, 355-369.