Descriptional Complexity of Formal Systems

Operational State Complexity Revisited: the Contribution of Monsters and Modifiers.- Hypercubes and Isometric Words based on Swap and Mismatch Distance.- Defying Gravity and Gadget Numerosity: The Complexity of the Hanano Puzzle.- Existential and Universal Width of Alternating Finite Automata.- On Jaffe's Pumping Lemma, Revisited     .- Operational Complexity: NFA-to-DFA Trade-Off.- The Word Problem for Finitary Automaton Groups.- Separating Words Problem over Groups.- Complexity of Exclusive Nondeterministic Finite Automata.- Shortest Accepted Strings for Two-Way Finite Automata: Approaching the  Lower Bound.- Pushdown and One-Counter Automata: Constant and Non-Constant Memory Usage.- Construction of a Bi-Infinite Power Free Word with a Given Factor and a Non-Recurrent Letter.- Merging two Hierarchies of External Contextual Grammars with Subregular Selection.- A Tight Upper Bound on the Length of Maximal Bordered Box Repetition-Free Words.