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- W318121553 abstract "Let e be a class of automata (in a precise sense to be defined) and ec the class obtained by augmenting each automaton in e with finitely many reversal-bounded counters. We first show that if the languages defined by e are effectively semilinear, then so are the languages defined by ec, and, hence, their emptiness problem is decidable. This result is then used to show the decidability of various problems concerning morphisms and commutation of languages. We also prove a surprising undecidability result: given a fixed two element code K, it is undecidable whether a given context-free language L commutes with K, i.e., LK = KL." @default.
- W318121553 created "2016-06-24" @default.
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- W318121553 date "2001-01-01" @default.
- W318121553 modified "2023-09-23" @default.
- W318121553 title "Decision Questions Concerning Semilinearity, Morphisms, and Commutation of Languages" @default.
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- W318121553 doi "https://doi.org/10.1007/3-540-48224-5_48" @default.
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