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A Pumping-Like Lemma for Languages over Infinite Alphabets

Authors: Yoav Danieli

Published in: LIPIcs, Volume 364, 43rd International Symposium on Theoretical Aspects of Computer Science (STACS 2026)


Abstract
We prove a kind of a pumping lemma for languages accepted by one-register alternating finite-memory automata. As a corollary, we obtain that the set of lengths of words in such languages is semi-linear.

Cite as

Yoav Danieli. A Pumping-Like Lemma for Languages over Infinite Alphabets. In 43rd International Symposium on Theoretical Aspects of Computer Science (STACS 2026). Leibniz International Proceedings in Informatics (LIPIcs), Volume 364, pp. 29:1-29:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2026)


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@InProceedings{danieli:LIPIcs.STACS.2026.29,
  author =	{Danieli, Yoav},
  title =	{{A Pumping-Like Lemma for Languages over Infinite Alphabets}},
  booktitle =	{43rd International Symposium on Theoretical Aspects of Computer Science (STACS 2026)},
  pages =	{29:1--29:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-412-3},
  ISSN =	{1868-8969},
  year =	{2026},
  volume =	{364},
  editor =	{Mahajan, Meena and Manea, Florin and McIver, Annabelle and Thắng, Nguy\~{ê}n Kim},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.STACS.2026.29},
  URN =		{urn:nbn:de:0030-drops-255185},
  doi =		{10.4230/LIPIcs.STACS.2026.29},
  annote =	{Keywords: infinite alphabets, pumping lemma, alternation, semi-linearity}
}
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