Journal of the ACM (JACM)
Reversal-Bounded Multicounter Machines and Their Decision Problems
Journal of the ACM (JACM)
Reversal-bounded multipushdown machines
Journal of Computer and System Sciences
Relational string verification using multi-track automata
CIAA'10 Proceedings of the 15th international conference on Implementation and application of automata
Multitape NFA: weak synchronization of the input heads
SOFSEM'12 Proceedings of the 38th international conference on Current Trends in Theory and Practice of Computer Science
Weak synchronization and synchronizability of multitape pushdown automata and turing machines
LATA'12 Proceedings of the 6th international conference on Language and Automata Theory and Applications
On the open problem of Ginsburg concerning semilinear sets and related problems
Theoretical Computer Science
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Given an n-tape automaton M with a one-way read-only head per tape and a right end marker $ on each tape, we say that M is aligned or 0-synchronized (or simply, synchronized) if for every n-tuple x=(x1, …, xn) that is accepted, there is a computation on x such that at any time during the computation, all heads, except those that have reached the end marker, are on the same position. When a head reaches the marker, it can no longer move. As usual, an n-tuple x=(x1, …, xn) is accepted if M eventually reaches the configuration where all n heads are on $ in an accepting state. In two recent papers, we looked at the problem of deciding, given an n-tape automaton of a given type, whether there exists an equivalent synchronized n-tape automaton of the same type. In this paper, we exhibit various classes of multitape automata which can(not) be converted to equivalent synchronized multitape automata.