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On the complexity of Simon automata over the Dyck language
In this paper the following problem is studied. Let be a finite alphabet where and are disjoint and equipotent sets. Let be a rational language over and let be the Simon distance automaton on L. Let be the square matrix with entries in the extended set of natural numbers given by the formula: for every pair of states of , is the minimum weight of a computation in from to labelled by a Dyck word if such a computation exists, otherwise it is . We exhibit a polynomial time algorithm which allows us to compute the matrix in the case in which is the unary alphabet. This result partially solves an open question raised in [F. d'Alessandro and J. Sakarovitch, Theoret. Comput. Sci. 293 (2003), no. 1, 55--82; MR1957613 (2003m:20025)]