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Decidability of code properties

Published online by Cambridge University Press:  25 September 2007

Henning Fernau
Fachbereich IV, Abteilung Informatik, Universität Trier, 54286 Trier, Germany;
Klaus Reinhardt
Wilhelm-Schickard-Institut für Informatik, Universität Tübingen, Sand 13, 72076 Tübingen, Germany;
Ludwig Staiger
Institut für Informatik, Martin-Luther-Universität Halle-Wittenberg, von-Seckendorff-Platz 1, 06099 Halle, Germany;
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We explore the borderline between decidability and undecidability of the following question: “Let C be a class of codes. Given a machine ${\mathfrak{M}}$ of type X, is it decidable whether the language $L({{\mathfrak{M}}})$ lies in C or not?” for codes in general, ω-codes, codes of finite and bounded deciphering delay, prefix, suffix and bi(pre)fix codes, and for finite automata equipped with different versions of push-down stores and counters.

Research Article
© EDP Sciences, 2007

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