  The purpose of the present article is to study and characterize sev- eral
types of symmetries of generalized Robertson-Walker space-times. Con- formal
vector fields, curvature and Ricci collineations are studied. Many im-
plications for existence of these symmetries on generalied Robertson-Walker
spacetimes are obtained. Finally, Ricci solitons on generalized Robertson-
Walker space-times admitting conformal vector fields are investigated.
