%0 Conference Proceedings
%T The Group of Reversible Turing Machines
%+ Laboratoire de l'Informatique du Parallélisme (LIP)
%+ Modèles de calcul, Complexité, Combinatoire (MC2)
%+ University of Turku
%+ Universidad de Chile = University of Chile [Santiago] (UCHILE)
%A Barbieri, Sebastián
%A Kari, Jarkko
%A Salo, Ville
%Z Part 2: Regular Papers
%< avec comité de lecture
%( Lecture Notes in Computer Science
%B 22th International Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA)
%C Zurich, Switzerland
%Y Matthew Cook
%Y Turlough Neary
%3 Cellular Automata and Discrete Complex Systems
%V LNCS-9664
%P 49-62
%8 2016-06-15
%D 2016
%R 10.1007/978-3-319-39300-1_5
%Z Computer Science [cs]Conference papers
%X We consider Turing machines as actions over configurations in <math xmlns="http://www.w3.org/1998/Math/MathML"> <msup> <mi>&#x03A3;<!-- Σ --></mi> <mrow class="MJX-TeXAtom-ORD"> <msup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="double-struck">Z</mi> </mrow> <mi>d</mi> </msup> </mrow> </msup></math>which only change them locally around a marked position that can move and carry a particular state. In this setting we study the monoid of Turing machines and the group of reversible Turing machines. We also study two natural subgroups, namely the group of finite-state automata, which generalizes the topological full groups studied in the theory of orbit-equivalence, and the group of oblivious Turing machines whose movement is independent of tape contents, which generalizes lamplighter groups and has connections to the study of universal reversible logical gates. Our main results are that the group of Turing machines in one dimension is neither amenable nor residually finite, but is locally embeddable in finite groups, and that the torsion problem is decidable for finite-state automata in dimension one, but not in dimension two.
%G English
%Z TC 1
%Z WG 1.5
%2 https://inria.hal.science/hal-01435034/document
%2 https://inria.hal.science/hal-01435034/file/395687_1_En_5_Chapter.pdf
%L hal-01435034
%U https://inria.hal.science/hal-01435034
%~ ENS-LYON
%~ CNRS
%~ INRIA
%~ UNIV-LYON1
%~ IFIP-LNCS
%~ INRIA-CHILE
%~ IFIP
%~ IFIP-TC
%~ IFIP-TC1
%~ IFIP-LNCS-9664
%~ IFIP-WG1-5
%~ IFIP-AUTOMATA
%~ INRIA-AUT
%~ UDL
%~ UNIV-LYON