In this paper, we introduce the L-separation axioms GT21
and GT5 using the notion of L-
neighborhood filter defined by G¨ahler in 1995. We define also the axiom GT6 depending on the
notion of L-numbers presented by G¨ahler in 1994. Denote by GTi-space for the L-topological space
which is GTi, i = 21
2 ; 5; 6. The GTi-spaces, i = 0; 1; 2; 3; 31
2 ; 4 had been introduced and studied
by the authors in 2001 - 2004 in separate six papers. All the axioms GTi are based only on usual
points and ordinary sets and they are the usual ones in the classical case L = f0; 1g. It is shown
here that the axioms GTi, i = 21
2 ; 5; 6 fulfill many properties analogous to the usual axioms and
moreover, the initial and the final of GTi-spaces are also GTi-spaces, i = 21
2 ; 5; 6.
Keywords: L-neighborhood filters; L-real numbers; GTi-spaces; GT21
-spaces; Completely normal
spaces; GT5-spaces; Perfectly normal spaces; GT6-spaces.