Track B: Logic, Semantics, Automata, and Theory of Programming.- Symmetric Groups and Quotient Complexity of Boolean Operations.- Handling Infinitely Branching WSTS.- Transducers with Origin Information.- Weak MSO+U with Path Quantifiers over Infinite Trees.- On the Decidability of MSO+U on Infinite Trees.- A Coalgebraic Foundation for Coinductive Union Types.- Turing Degrees of Limit Sets of Cellular Automata.- On the Complexity of Temporal-Logic...