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Two-Way Reversible Multi-Head Finite Automata

Morita K.

Fundamenta Informaticae

2011

Vol. 110, nr 1-4

241-254

A two-way reversible multi-head finite automaton (RMFA) is introduced as a simple model of reversible computing, and its language accepting capability is studied. We show that various non-regular context-free languages, and non-context-free context-sensitive languages are accepted by RMFAs with a few heads. For example, we give an RMFA with three heads that accepts the language consisting of all words whose length is a prime number. A construction method of a garbage-less RMFA from a given RFMA is also shown.