Theory Is Forever [electronic resource] : Essays Dedicated to Arto Salomaa on the Occasion of His 70th Birthday / edited by Juhani Karhumäki, Hermann Maurer, Gheorghe Păun, Grzegorz Rozenberg.

Duality for Three: Ternary Symmetry in Process Spaces -- Mathematical Proofs at a Crossroad? -- Rational Relations as Rational Series -- Networks of Standard Watson-Crick D0L Systems with Incomplete Information Communication -- On the Size of Components of Probabilistic Cooperating Distributed Grammar Systems -- Remarks on Sublanguages Consisting of Primitive Words of Slender Regular and Context-Free Languages -- A Semiring-Semimodule Generalization of ?-Context-Free Languages -- Integer Weighted Finite Automata, Matrices, and Formal Power Series over Laurent Polynomials -- Two Models for Gene Assembly in Ciliates -- On Self-Dual Bases of the Extensions of the Binary Field -- On NFA Reductions -- Some Results on Directable Automata -- Rectangles and Squares Recognized by Two-Dimensional Automata -- Substitution on Trajectories -- Recombination Systems -- Algebraic Aspects of Parikh Matrices -- On Distributed Computing on Elliptic Curves -- On the Formal Modelling of Trust in Reputation-Based Systems -- Issues with Applying Cryptography in Wireless Systems -- On a Tomographic Equivalence Between (0,1)-Matrices -- P Systems with Tables of Rules -- Some Properties of Multistage Interconnection Networks -- Structural Equivalence of Regularly Extended E0L Grammars: An Automata Theoretic Proof -- Complexity of Evolving Interactive Systems.