The Second Colloquium on Automata, Languages and Programming is the successor of a similar Colloquium organized by IRIA in Paris, July 3-7, 1972. The present Colloquium which takes place at the Unl-­ versity of Saarbrucken from July 29th to August 2nd, 1974, is spon­ sored by the Gesellschaft fur. Informatik and organized in cooperation wlth the Special Interest Group on Automata and Computability Theory (SIGACT) and with the European Association for Theoretical Computer Science (EATCS). As its predecessor the present Colloquium is devoted to the theo­ retical bases of computer science. This volume contains the text of the different lectures of the Colloquium whlch have been selected by the Program Committee out of about 130 submitted papers. About one third of the papers of this volume is concerned with formal language theory, one other third with the theory of computation and the rest with complexity theory, automata theory, programming languages, etc.

The generative power of two-level grammars.- A generalisation of Parikh's theorem in formal language theory.- Checking stacks and context-free programmed grammars accept p-complete languages.- Recursion and parameter mechanisms: An axiomatic approach.- Dynamic programming schemata.- Semantic characterization of flow diagrams and their decomposability.- On the most recent property of ALGOL-like programs.- Langages sans etiquettes et transformations de programmes.- Relations between semantics and complexity of recursive programs-.- On the relation between direct and continuation semantics.- Graph representation and computation rules for typeless recursive languages.- Application of Church-Rosser properties to increase the parallelism and efficiency of algorithms.- Combinatorial problems, combinator equations and normal forms.- Algorithmes d'Equivalence et de reduction a des expressions minimales dans une classe d'equations recursives simples.- Automatic generation of multiple exit parsing subroutines.- Production prefix parsing.- On eliminating unit productions from LR(k) parsers.- Deterministic techniques for efficient non-deterministic parsers.- File organization, an application of graph theory.- Characterizations of time-bounded computations by limited primitive recursion.- On maximal merging of information in Boolean computations.- On simple Goedel numberings and translations.- The 'almost all' theory of subrecursive degrees is decidable.- The computational complexity of program schemata.- Un resultat en theorie des groupes de permutations et son application au calcul effectif du groupe d'automorphismes d'un automate fini.- Sur l'Application du theoreme de suschkewitsch a l'etude des codes rationnels complets.- Composition of automata.- Context-free grammarforms.- Une suite decroissante de cônes rationnels.- Komplexitätsmaße for Ausdrocke.- Efficient procedures for using matrix algorithms.- Further schemes for combining matrix algorithms.- On the structure of complexity classes.- On sets having only hard subsets.- Turing machines with associative memory access.- Trade-off between the use of nonterminals, codings and homomorphisms in defining languages for some classes of rewriting systems.- Operators reducing generalized OL-systems.- Parallel rewriting systems on terms.- Transductions of context-free languages into sets of sentential forms.- Parallelism in rewriting systems.- Mehrdeutigkeiten kontextfreier Grammatiken.- Monadic program schemes under restricted classes of free interpretations.- Generalized program schemas.- A decidability result for sequential grammars.- Effectivity problems of algorithmic logic.- Simple and structural redundancy in non-deterministic computation.- Sur une propriete syntactique des relations rationnelles.