Formal Methods and the Theory of Social Choice.- Relations Making Their Way from Logics to Mathematics and Applied Sciences.- Boolean Logics with Relations.- Relation Algebra and RelView in Practical Use: Construction of Special University Timetables.- A Relation Algebraic Semantics for a Lazy Functional Logic Language.- Latest News about Demonic Algebra with Domain.- On the Structure of Demonic Refinement Algebras with Enabledness and Termination.- Multi-objective Problems in Terms of Relational Algebra.- The Lattice of Contact Relations on a Boolean Algebra.- A Non-probabilistic Relational Model of Probabilistic Kleene Algebras.- Increasing Bisemigroups and Algebraic Routing.- Lazy Relations.- The Algebraic Approach I: The Algebraization of the Chomsky Hierarchy.- The Algebraic Approach II: Dioids, Quantales and Monads.- Automated Reasoning for Hybrid Systems — Two Case Studies —.- Non-termination in Idempotent Semirings.- Formal Concepts in Dedekind Categories.- The Structure of the One-Generated Free Domain Semiring.- Determinisation of Relational Substitutions in Ordered Categories with Domain.- Boolean Algebras and Stone Maps in Schröder Categories.- Cardinality in Allegories.- Solving Linear Equations in *-continuous Action Lattices.- Reactive Probabilistic Programs and Refinement Algebra.- Knowledge and Games in Modal Semirings.- Theorem Proving Modulo Based on Boolean Equational Procedures.- Rectangles, Fringes, and Inverses.- An Ordered Category of Processes.- Automatic Proof Generation in Kleene Algebra.