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Descriptional complexity of two-way pushdown automata with restricted head reversals
2012
Theoretical Computer Science
Two-way nondeterministic pushdown automata (2PDA) are classical nondeterministic pushdown automata (PDA) enhanced with two-way motion of the input head. In this paper, the subclass of 2PDA accepting bounded languages and making at most a constant number of input head turns is studied with respect to descriptional complexity aspects. In particular, the effect of reducing the number of pushdown reversals to a constant number is of interest. It turns out that this reduction leads to an exponential
doi:10.1016/j.tcs.2012.04.007
fatcat:cfomcx33jzd5ppxar4gkaxjziq