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Reversible Multi-head Finite Automata Characterize Reversible Logarithmic Space

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Part of the Lecture Notes in Computer Science book series (LNTCS,volume 7183)

Abstract

Deterministic and non-deterministic multi-head finite automata are known to characterize the deterministic and non- deterministic logarithmic space complexity classes, respectively. Recently, Morita introduced reversible multi-head finite automata (RMFAs), and posed the question of whether RMFAs characterize reversible logarithmic space as well. Here, we resolve the question affirmatively, by exhibiting a clean RMFA simulation of logarithmic space reversible Turing machines. Indirectly, this also proves that reversible and deterministic multi-head finite automata recognize the same languages.

Keywords

  • Turing Machine
  • Transition Rule
  • Unary Counter
  • Input Tape
  • Track Head

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Axelsen, H.B. (2012). Reversible Multi-head Finite Automata Characterize Reversible Logarithmic Space. In: Dediu, AH., Martín-Vide, C. (eds) Language and Automata Theory and Applications. LATA 2012. Lecture Notes in Computer Science, vol 7183. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28332-1_9

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  • DOI: https://doi.org/10.1007/978-3-642-28332-1_9

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-28331-4

  • Online ISBN: 978-3-642-28332-1

  • eBook Packages: Computer ScienceComputer Science (R0)