Declarative Encodings of Acyclicity Properties

ABSTRACT. Many knowledge representation tasks involve trees or similar structures as abstract datatypes. However, devising compact and efficient declarative representations of such structural properties is non-obvious and can be challenging indeed. In this paper, we take a number acyclicity properties into consideration and investigate various logic-based approaches to encode them. We use answer set programming as the primary representation language but also consider mappings to related formalisms, such as propositional logic, difference logic, and linear programming. We study the compactness of encodings and the resulting computational performance on benchmarks involving acyclic or tree structures.