This volume presents a collection of 33 papers on formal language theory arranged for the occasion of the 50th birthday of Jurgen Dassow. The papers cover such topics as co-operating distributed grammar systems, infinite words, algebraic approaches to language, and regulated rewriting.

A grammatical approach to the LBA problem.- Conditional context-free languages of finite index.- On the number of nonterminals in matrix grammars with leftmost derivations.- The accepting power of finite automata over groups.- Controlled fuzzy parallel rewriting.- On controlling rewriting by properties of strings and symbols.- Accepting array grammars with control mechanisms.- On restarting automata with rewriting.- Deterministic cooperating distributed grammar systems.- Grammar systems with counting derivation and dynamical priorities.- Characterization of RE using CD grammar systems with two registers and RL rules.- On cooperating distributed uniformly limited 0L systems.- Teams in grammar systems: Sub-context-free cases.- A note on the incomparability of the E0L family with certain families of languages generated by cooperating grammar systems.- Colonies as models of reactive systems.- Grammatical inference of colonies.- A grammar characterization of logarithmic-space computation.- On the computational complexity of context-free Parallel Communicating Grammar Systems.- Parallel communicating grammar systems with communication by signals.- PC grammar systems versus some non-context-free constructions from natural and artificial languages.- Grammar systems for the description of certain natural language facts.- Networks of parallel language processors.- A reduced distributed splicing system for RE languages.- On the generative capacity of splicing grammar systems.- Array splicing systems.- Two lower bounds on computational complexity of infinite words.- On ?-power languages.- Shuffle-like operations on ?-words.- Generalized Lindenmayerian algebraic systems.- The structure of the basic morphisms.- On mix operation.- On the complexity of iterated insertions.- Thedecidability of the generalized confluence problem for context-free languages.

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