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\({\mathcal C}\)-Varieties, Actions and Wreath Product

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Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 3887))

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Abstract

Motivated by open problems in language theory, logic and circuit complexity, Straubing generalized Eilenberg’s variety theory, introducing the \({\mathcal C}\)-varieties. As a further contribution to this theory, this paper first studies a new \({\mathcal C}\)-variety of languages, lying somewhere between star-free and regular languages. Then, continuing the early works of Esik-Ito, we extend the wreath product to \({\mathcal C}\)-varieties and generalize the wreath product principle, a powerful tool originally designed by Straubing for varieties. We use it to derive a characterization of the operations LLaA* and LLa on languages. Finally, we investigate the decidability of the operation VV ∗ LI (the wreath product by locally trivial semigroups) and solve it explicitely in several non-trivial cases.

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Chaubard, L. (2006). \({\mathcal C}\)-Varieties, Actions and Wreath Product. In: Correa, J.R., Hevia, A., Kiwi, M. (eds) LATIN 2006: Theoretical Informatics. LATIN 2006. Lecture Notes in Computer Science, vol 3887. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11682462_28

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  • DOI: https://doi.org/10.1007/11682462_28

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-32755-4

  • Online ISBN: 978-3-540-32756-1

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