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DOI: 10.4230/LIPIcs.FSTTCS.2018.48
Reducing Transducer Equivalence to Register Automata Problems Solved by "Hilbert Method"

Authors: Adrien Boiret, Radoslaw Piórkowski, and Janusz Schmude

Published in: LIPIcs, Volume 122, 38th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2018)

Abstract
In the past decades, classical results from algebra, including Hilbert's Basis Theorem, had various applications in formal languages, including a proof of the Ehrenfeucht Conjecture, decidability of HDT0L sequence equivalence, and decidability of the equivalence problem for functional tree-to-string transducers. In this paper, we study the scope of the algebraic methods mentioned above, particularily as applied to the functionality problem for register automata, and equivalence for functional register automata. We provide two results, one positive, one negative. The positive result is that functionality and equivalence are decidable for MSO transformations on unordered forests. The negative result comes from a try to extend this method to decide functionality and equivalence on macro tree transducers. We reduce macro tree transducers equivalence to an equivalence problem for some class of register automata naturally relevant to our method. We then prove this latter problem to be undecidable.
Cite as

Adrien Boiret, Radoslaw Piórkowski, and Janusz Schmude. Reducing Transducer Equivalence to Register Automata Problems Solved by "Hilbert Method". In 38th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 122, pp. 48:1-48:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{boiret_et_al:LIPIcs.FSTTCS.2018.48,
  author =	{Boiret, Adrien and Pi\'{o}rkowski, Radoslaw and Schmude, Janusz},
  title =	{{Reducing Transducer Equivalence to Register Automata Problems Solved by "Hilbert Method"}},
  booktitle =	{38th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2018)},
  pages =	{48:1--48:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-093-4},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{122},
  editor =	{Ganguly, Sumit and Pandya, Paritosh},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2018.48},
  URN =		{urn:nbn:de:0030-drops-99479},
  doi =		{10.4230/LIPIcs.FSTTCS.2018.48},
  annote =	{Keywords: formal language, Hilbert's basis theorem, transducers, register automata, equivalence problem, unordered trees, MSO transformations}
}
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