Highly Influenced

@article{Birget1996TwowayAA, title={Two-way automata and length-preserving homomorphisms}, author={Jean-Camille Birget}, journal={Mathematical systems theory}, year={1996}, volume={29}, pages={191-226} }

- Published 1996 in Mathematical systems theory
DOI:10.1007/BF01201276

Closure underlength-preserving homomorphisms is interesting because of its similarity tonondeterminism. We give a characterization of NP in terms of length-preserving homomorphisms and present related complexity results. However, we mostly study the case of two-way finite automata: Let l.p.hom[n state 2DFA] denote the class of languages that are length-preserving homomorphic images of languages recognized byn-state 2DFAs. We give a machine characterization of this class. We show that any… CONTINUE READING