Titlebook: Relational and Algebraic Methods in Computer Science; 21st International C Uli Fahrenberg,Wesley Fussner,Roland Glück Conference proceeding

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,Complete Congruences of Completely Distributive Lattices,monotone paths from (0, 0) to (1, 1). This lattice is completely distributive. We give a general description of the complete congruences of completely distributive lattice s by means of an interior operator on the collection of closed subsets of an associated topological space. In particular, we sho

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,Undecidability of the Positive Calculus of Relations with Transitive Closure and Difference: Hypothstant. Furthermore, we show that the emptiness (unsatisfiability) problem is also .-complete for propositional while-programs with graph loops on functional structures. To this end, we give a hypothesis elimination using graph loops. Using this, we give reductions from the periodic domino problem.

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,-Fuzzy Weak Preference, Preference, and Choice Relations,eference relation indicating that the individual definitely prefers one alternative over the other, by a weak preference relation indicating that the individual prefers one alternative over the other or is indifferent between the alternatives, or by a choice relation indicating which alternative the

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Lifting Star-Autonomy,egory .—of symmetric monoidal, symmetric monoidal closed, .-autonomous structures. Our systematic study relies on a bijection between liftings of functors to the total categories and some kind of lax-natural transformations, and yields exact conditions for these liftings..When . factors as a monoida

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,A Matrix-Oriented View of Bisimulation Quotients over Dioid-Labeled Transition Systems,share some properties with common bisimulations. A particular focus is on bisimulation equivalences and their induced quotients where we show some observations regarding linear equations, eigenvectors, and eigenvalues.