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DOI: 10.4230/LIPIcs.FSTTCS.2009.2312
URN: urn:nbn:de:0030-drops-23122
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Cabessa, Jérémie ; Duparc, Jacques ; Facchini, Alessandro ; Murlak, Filip

The Wadge Hierarchy of Max-Regular Languages

09005.CabessaJeremie.2312.pdf (0.2 MB)


Recently, Miko{\l}aj Boja{\'n}czyk introduced a class of max-regular languages, an extension of regular languages of infinite words preserving manyof its usual properties. This new class can be seen as a different way of generalising the notion of regularity from finite to infinite words. This paper compares regular and max-regular languages in terms of topological complexity.It is proved that up to Wadge equivalence the classes coincide. Moreover, when restricted to $\mathbf{\Delta}^0_2$-languages, the classes contain virtually the same languages. On the other hand, separating examples of arbitrary complexity exceeding $\mathbf{\Delta}^0_2$ are constructed.

BibTeX - Entry

  author =	{J{\'e}r{\'e}mie Cabessa and Jacques Duparc and Alessandro Facchini and Filip Murlak},
  title =	{{The Wadge Hierarchy of Max-Regular Languages}},
  booktitle =	{IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science},
  pages =	{121--132},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-13-2},
  ISSN =	{1868-8969},
  year =	{2009},
  volume =	{4},
  editor =	{Ravi Kannan and K. Narayan Kumar},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-23122},
  doi =		{10.4230/LIPIcs.FSTTCS.2009.2312},
  annote =	{Keywords: Max-regular languages, Wadge hierarchy, Wagner hierarchy}

Keywords: Max-regular languages, Wadge hierarchy, Wagner hierarchy
Collection: IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science
Issue Date: 2009
Date of publication: 14.12.2009

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