FILOMAT, vol.31, no.4, pp.913-923, 2017 (SCI-Expanded)
The Modular group Gamma acts on the set of extended rational numbers Q transitively. Here, our main purpose is to examine some properties of hyperbolic paths of minimal lengths in the suborbital graphs for Gamma. We characterize all vertices of these hyperbolic paths in the suborbital graphs which are trees.