*Definition [#jbe2d1a8]
-A topological space (X,τ) is said to be T_a if the following is satisfied;
++&ref(http://www.eaflux.com/imgtex/imgtex.fcgi?%5bres=100%5d%7b%5c%5b%20%5coverline%7b%5c%7bx%5c%7d%7d=%5c%7bx%5c%7d%20%5c%5d%7d%25.png); or &ref(http://www.eaflux.com/imgtex/imgtex.fcgi?%5bres=100%5d%7b%5c%5b%20%5coverline%7b%5c%7bx%5c%7d%7d%20%5c%5d%7d%25.png); contains at least three elements for each point x of X;
++X contains at most one element x such that &ref(http://www.eaflux.com/imgtex/imgtex.fcgi?%5bres=100%5d%7b%5c%5b%20%5coverline%7b%5c%7bx%5c%7d%7d%5cneq%5c%7bx%5c%7d%20%5c%5d%7d%25.png);.

*Property [#p0da1583]
-A [[normal]] T_a space is a [[T_4]] space.

*Reference [#e8a165dd]
-Y.W. Kim , ''A note on separation axioms weaker than T1.'', Kyungpook Math. J. 6 21-26 (1964).