Titlebook: Descriptional Complexity of Formal Systems; 13 International Wor Markus Holzer,Martin Kutrib,Giovanni Pighizzini Conference proceedings 201

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The Power of Diversity of the languages being recognized. In this expository paper, we will first survey some basic ideas that have been useful in this model. In the second part, we sketch how this dual approach can be generalized to study some important class of boolean circuits, what results have been obtained, what qu

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On the Number of Components and Clusters of Non-returning Parallel Communicating Grammar Systemsminimal number of components necessary to generate all recursively enumerable languages. We present a construction which improves the currently known best bounds of seven (with three predefined clusters) and six (in the non-clustered case) to five, in both cases (having four clusters in the clustere

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On Contextual Grammars with Subregular Selection Languagesconsider families . which are obtained by restriction to . states or nonterminals or productions or symbols to accept or to generate regular languages, we obtain four infinite hierarchies of the corresponding families of languages generated by external contextual grammars with selection languages in

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-Local Internal Contextual Grammarsl grammars. These grammars are, in fact, classical internal contextual grammars, but their only permitted derivations are those that can be described in a restricted manner (that depends on the number .). Using this formalism we define different classes of languages, and obtain a series of language

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