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NMR 2026: "Best Paper Award"

Das Papier "On the Complexity of the Discussion-based Semantics in Abstract Argumentation" von Lydia Blümel, Kai Sauerwald, Kenneth Skiba und Matthias Thimm erhielt den "Best Paper Award" bei dem NMR 2026 (The 24th International Workshop on Nonmonotonic Reasoning).

Abstract:

We show that deciding whether an argument a is stronger than an argument b with respect to the discussion-based semantics of Amgoud and Ben-Naim is decidable in polynomial time. At its core, this problem is about deciding whether, for two vertices in a graph, the number of walks of each length ending in those vertices is the same. We employ results from automata theory and reduce this problem to the equivalence problem for semiring automata. This offers a new perspective on the computational complexity of ranking semantics, an area in which the complexity of many semantics remains open.