Degrees of (Non)Monotonicity of RRW-Automata
نویسندگان
چکیده
We introduce and study the notion of j-monotonicity of RRand RRW -automata (special types of restarting automata without working symbols). We show that the j-monotonicity can be considered as a degree of non-context-freeness of languages recognized by RRW -automata and RR-automata. 1-monotonic RRW -automata recognize a subset of the class of context-free languages. For j > 1, the j-monotonic RRW -automata recognize also some non-context-free languages and the j-monotonic RRW -automata as well as the j-monotonic RR-automata form a strict hierarchy with respect to the parameter j.
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