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In this paper, we reformulate the definition of the iterated function systems(denoted by general IFSs in this paper) and show the existence and uniqueness(in some sense) of the limit sets generated by the general IFSs, to unify thedefinitions of the limit sets introduced before. Note that the general IFSs aredefined on (possibly unbounded) complete metric spaces and we instead assume a``natural" condition of general IFSs to show the main result. To obtain themain result, we apply techniques in the Banach fixed point theorem to thegeneral IFSs with the ``natural" condition. Besides, we consider an example ofgeneral IFSs.

Understanding the limit sets generated by general iterated function systems on unbounded spaces