Realtime subshifts
We generalize the class of sofic subshifts, which correspond to regular languages, to subshifts accepted by either nondeterministic or deterministic Turing machines in real time. We show that every substitutive system can be accepted by a deterministic Turing machine in real time. (C) 2000 Elsevier Science B.V. All rights reserved.
subshift turing machine substitution