Formal and Natural Computing: Essays Dedicated to Grzegorz by Jean Berstel, Luc Boasson (auth.), Wilfried Brauer, Hartmut

By Jean Berstel, Luc Boasson (auth.), Wilfried Brauer, Hartmut Ehrig, Juhani Karhumäki, Arto Salomaa (eds.)

This ebook provides cutting-edge study in theoretical computing device technological know-how and similar ?elds. particularly, the next parts are mentioned: automata idea, formal languages and combinatorics of phrases, graph alterations, Petri nets, concurrency, in addition to ordinary and molecular computing. The articles are written by way of best researchers in those parts. The writers have been initially invited to give a contribution to this e-book yet then the conventional refereeing process was once utilized in addition. the entire articles care for a few factor that has been below energetic learn in the course of contemporary years. nonetheless, the themes diversity from very classical ones to concerns raised merely or 3 years in the past. either survey articles and papers attacking speci?c examine difficulties are incorporated. The booklet highlights a few key problems with theoretical computing device technology, as they appear to us now firstly of the hot millennium. Being a accomplished evaluate of a few of the main lively present study in theoretical laptop technology, it may be of de?nite curiosity for all researchers within the components coated. the themes variety from simple decidability and the concept of knowledge to graph grammars and graph alterations, and from bushes and lines to aqueous algorithms, DNA encoding and self-assembly. designated e?ort has been given to lucid presentation. for this reason, the booklet will be of curiosity additionally for complicated students.

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Extra resources for Formal and Natural Computing: Essays Dedicated to Grzegorz Rozenberg

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By a general result on congruences, [u1 ] · · · [un ] ⊂ [u] If n > N , then u is the equivalence class of words that are not factors of L. Otherwise, [u] contains at least one of the q + q 2 + · · · q N products of equivalence classes. Thus the number of equivalence classes of L intersecting D∗ is bounded by this number. The proposition is false if the width is unbounded. 5. Consider the language L = {a(b¯b)n (c¯ c)n a ¯ | n > 0} of the preceding example. There are just for classes of the syntactic congruence of L intersecting D.

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It is easy to qualify a grammar. For this, every variable X is replaced by variables Xu , one for each u ∈ Irr(X). In each production Y → m, each variable X in the handle is replaced by all possible Xu . For each new handle m obtained in this way, substitute u for Xu for all variables, and then compute the reduced word r of the resulting word. The word r is in Irr(Y ). Add the production Yr → m . When this is done for all possible choices, the resulting grammar is qualified. We recall the following two lemmas from [1].

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