Quantifying over Optimum Answer Sets

• URL: http://arxiv.org/abs/2408.07697v1
• Date: Wed, 14 Aug 2024 17:53:13 GMT
• Title: Quantifying over Optimum Answer Sets
• Authors: Giuseppe Mazzotta, Francesco Ricca, Mirek Truszczynski,
• Abstract summary: ASP(Q) lacks a method for encoding modeling in an elegant and compact way. We propose an extension of ASP(Q) in which component programs may contain weak constraints. We showcase the modeling capabilities of the new formalism through various application scenarios.
• Score: 6.390468088226495
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Answer Set Programming with Quantifiers (ASP(Q)) has been introduced to provide a natural extension of ASP modeling to problems in the polynomial hierarchy (PH). However, ASP(Q) lacks a method for encoding in an elegant and compact way problems requiring a polynomial number of calls to an oracle in $\Sigma_n^p$ (that is, problems in $\Delta_{n+1}^p$). Such problems include, in particular, optimization problems. In this paper we propose an extension of ASP(Q), in which component programs may contain weak constraints. Weak constraints can be used both for expressing local optimization within quantified component programs and for modeling global optimization criteria. We showcase the modeling capabilities of the new formalism through various application scenarios. Further, we study its computational properties obtaining complexity results and unveiling non-obvious characteristics of ASP(Q) programs with weak constraints.

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