Title: Formal grammar
Subjects: Comparative and general Grammar, Formalization (Linguistics), Congresses, Computational linguistics, Data processing, Algebra, Artificial intelligence, Computer science, Mathematical linguistics, Natural language processing (computer science), System design, Language and languages, Grammars, Symbolic and Algebraic Manipulation, Computation by Abstract Devices, Mathematical Logic and Formal Languages, Artificial Intelligence (incl. Robotics)