Deterministic and unambiguous two-dimensional languages over one-letter alphabet

  title={Deterministic and unambiguous two-dimensional languages over one-letter alphabet},
  author={Marcella Anselmo and Maria Madonia},
  journal={Theor. Comput. Sci.},
The paper focuses on deterministic and unambiguous recognizable two-dimensional languageswith particular attention to the case of a one-letter alphabet. The family DREC(1) of deterministic languages over a one-letter alphabet is characterized as bothL(DOTA)(1), the class of languages accepted by deterministic on-line tessellation acceptors, and L(2AFA)(1), the class of languages recognized by 2-way alternating finite automata. We show that there are inherently ambiguous languages and… CONTINUE READING

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