Generalizations of Generalized Finite State Machines Yo Sub Han Department of Computer Science HKUST October 31, 2003 11-11:50 AM Room 3501, HKUST Abstract -------- We introduce the notions of expression automata and deterministic expression automata. We characterize deterministic expression automata with prefix-freeness. The results can be viewed as a generalization of the characterization of generalized automata. Besides, we show that deterministic expression automaton languages are a proper subset of regular languages. We also show the minimization of deterministic expression automata. This is joint work with D. Wood.