A word is said to be primitive if it cannot be represented as any power of another word. It is a well-known conjecture that the set of all primitive words Q over a non-trivial alphabet is not context-free: this conjecture is still open. In this book, the authors deal with properties of primitive words over a non-primitive alphabet, the language consisting of all primitive words and related languages. Moreover, some decidable and undecidable problems with respect to the above languages are discussed as well. As another try, a search for a non-phrase structure grammar which generates Q is performed.

This book constitutes the proceedings of the 4th International Conference, LATA 2010, held in May 2010 in Trier, Germany. The 47 full papers presented were carefully selected from 115 submissions and focus on topics such as algebraic language theory , algorithmic learning, bioinformatics, computational biology, pattern recognition, program verification, term rewriting and tree machines.

This commemorative book celebrates the 70th birthday of Arto Kustaa Salomaa, one of the most influential researchers in theoretical computer science. The 24 invited papers by leading researchers in the area address a broad variety of topics in theoretical computer science and impressively reflect the breadth and the depth of Arto Salomaa's scientific work.

The research results published in this set of proceedings range from pure semigroup theory to theoretical computer science, in particular formal languages and automata. Contributed by internationally recognized researchers, the papers address issues in the algebraic and combinatorial theories of semigroups, the structure theory of automata, the classification theory of formal languages and codes and applications of these theories to various areas like circuit testing, coding theory, or cryptography. The underlying theme is the semigroup and automaton theories and their role in certain applications.

This book constitutes the refereed proceedings of the 15th International Conference on Developments in Language Theory, DLT 2011, held in Milano, Italy, in July 2011. The 34 regular papers presented were carefully reviewed and selected from numerous submissions. The volume also contains the papers or abstracts of 5 invited speakers, as well as a 2-page abstract for each of the 7 poster papers. The topics covered include grammars, acceptors and transducers for words, trees and graphs; algebraic theories of automata; codes; symbolic dynamics; algorithmic, combinatorial and algebraic properties of words and languages; decidability questions; applications of language theory, including: natural computing, image manipulation and compression, text algorithms, cryptography, concurrency, complexity theory and logic; cellular automata and multidimensional patterns; language theory aspects of quantum computing and bio-computing.

This is an excellent collection of papers dealing with combinatorics on words, codes, semigroups, automata, languages, molecular computing, transducers, logics, etc., related to the impressive work of Gabriel Thierrin. This volume is in honor of Professor Thierrin on the occasion of his 80th birthday. Contents: Some Operators on Families of Fuzzy Languages and Their Monoids (P R J Asveld); Liars, Demons, and Chaos (C S Calude et al.); Conditional Grammars with Restrictions by Syntactic Parameters (J Dassow); Circularity and Other Invariants of Gene Assembly in Ciliates (A Ehrenfeucht et al.); Catenation Closed Pairs and Forest Languages (C-M Fan & H-J Shyr); Valence Grammars with Target Sets (H Fernau & R Stiebe); Minimal Recognizers and Syntactic Monoids of DR Tree Languages (F G(r)cseg & M Steinby); Visualizing Languages Using Primitive Powers (T Head); Disjunctivity (H Jrgensen); String Operations Suggested by DNA Biochemistry: The Balanced Cut Operation (L Kari & A P(un); How to Generate Binary Codes Using Context-Free Grammars (L Kiszonyi); Generation and Parsing of Morphism Languages by Uniquely Parallel Parsable Grammars (J Lee & K Morita); On the Generative Power of Iterated Transductions (V Manca); Words, Dyck Paths, Trees, and Bijections (H Prodinger); Iterated Morphisms with Complementarity on the DNA Alphabet (A Salomaa); Topologies for the Set of Disjunctive e -Words (L Staiger); and other papers. Readership: Researchers in mathematics and computer science."

This book constitutes the refereed proceedings of the 10th International Conference on Language and Automata Theory and Applications, LATA 2016, held in Prague, Czech Republic, in March 2016. The 42 revised full papers presented together with 5 invited talks were carefully reviewed and selected from 119 submissions. The papers cover the following topics: algebraic language theory; algorithms for semi-structured data mining, algorithms on automata and words; automata and logic; automata for system analysis and program verification; automata networks, concurrency and Petri nets; automatic structures; cellular automata, codes, combinatorics on words; computational complexity; data and image compression; descriptional complexity; digital libraries and document engineering; foundations of finite state technology; foundations of XML; fuzzy and rough languages; grammatical inference and algorithmic learning; graphs and graph transformation; language varieties and semigroups; parallel and regulated rewriting; parsing; patterns; string and combinatorial issues in computational biology and bioinformatics; string processing algorithms; symbolic dynamics; term rewriting; transducers; trees, tree languages and tree automata; weighted automata.