MEMORY REQUIREMENTS OF TWO-WAY VERSUS ONE-WAY AUTOMATA.
IOWA UNIV IOWA CITY DEPT OF MATHEMATICS
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The article presents an example of a two-way automaton which has significantly fewer states than any one-way automaton accepting the same set of tapes. Thus, memory space can be saved by using a two-way automaton. This savings in space, however, is accompanied by an increase in recognition time. Author