  We study the localized tachyon condensation (LTC) of non-supersymmetric
orbifold backgrounds in their mirror Landau-Ginzburg picture. Using he
existence of four copies of (2,2) worldsheet supersymmetry, we show at the CFT
level, that the minimal tachyon mass in twisted sectors shows somewhat
analogous properties of c- or g-function. Namely, $m := |\alpha' M^2_{min}| $
satisfies $m(M) \geq m(D_1\oplus D_2)={\rm max} \{m(D_1),m(D_2)\}$.
  $c$- $g$- $m$- functions share the common property $ f(M)\geq f(D_1\oplus
D_2)$ for $f=c,g,m$, although they have different behavior in detail.
