Titlebook: New Trends in Formal Languages; Control, Cooperation Gheorghe P?un,Arto Salomaa Book 1997 Springer-Verlag Berlin Heidelberg 1997 Formale Sp

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Conditional context-free languages of finite index,onograph on regulated rewriting. Moreover, we show that conditional context-free languages with context-free conditions of finite index are more powerful than conditional context-free languages with regular conditions of finite index. Furthermore, we study the complexity of membership and non-emptin

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The accepting power of finite automata over groups,idered, in comparison with the non-abelian groups. We prove that this is due to the commutativity. Each language accepted by a finite automaton over an abelian group is actually a unordered vector language. Finally, deterministic finite automata over groups are investigated.

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Grammatical inference of colonies,sed on presentation of positive and negative examples of strings is then described, together with an algorithm for extracting a colony from trained neural network. Some examples of the inference of colonies generating/accepting simple context-free languages illustrate the function of the architectur

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