Algebraic Informatics 3rd International Conference on Algebraic Informatics, CAI 2009, Thessaloniki, Greece, Mai 19-22, 2009

Invited Paper of Werner Kuich.- Cycle-Free Finite Automata in Partial Iterative Semirings.- Tutorials.- Picture Languages: From Wang Tiles to 2D Grammars.- Process Algebra: An Algebraic Theory of Concurrency.- Invited Papers.- On Several Proofs of the Recognizability Theorem.- Theories of Automatic Structures and Their Complexity.- The Graph Programming Language GP.- Canonical Reduction Systems in Symbolic Mathematics.- Contributed Papers.- Solving Norm Form Equations over Number Fields.- A Note on Unambiguity, Finite Ambiguity and Complementation in Recognizable Two-Dimensional Languages.- Context-Free Categorical Grammars.- An Eilenberg Theorem for Pictures.- On the Complexity of the Syntax of Tree Languages.- On the Reversibility of Parallel Insertion, and Its Relation to Comma Codes.- Computation of Pell Numbers of the Form pX 2.- Iteration Grove Theories with Applications.- Combinatorics of Finite Words and Suffix Automata.- Polynomial Operators on Classes of Regular Languages.- Self-dual Codes over Small Prime Fields from Combinatorial Designs.- A Backward and a Forward Simulation for Weighted Tree Automata.- Syntax-Directed Translations and Quasi-alphabetic Tree Bimorphisms — Revisited.- Polynomial Interpolation of the k-th Root of the Discrete Logarithm.- Single-Path Restarting Tree Automata.- Parallel Communicating Grammar Systems with Regular Control.