Issue No. 04 - April (1971 vol. 20)
B.H. Barnes , Dep. Comput. Sci. Pennsylvania State Univ.
This correspondence 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, in this particular case, memory space can be saved by using a two-way automaton. This savings in space, however, is accompanied by an increase in recognition time.
Finite automaton, one-way automaton, regular sets, two-way automaton.
B.H. Barnes, "A Two-Way Automaton with Fewer States than Any Equivalent One-Way Automaton", IEEE Transactions on Computers, vol. 20, no. , pp. 474-475, April 1971, doi:10.1109/T-C.1971.223273