Core Concepts

Inquisitive propositional and modal logic model checking problems are proven to be AP-complete.

Abstract

The paper explores the complexity of model checking for inquisitive propositional and modal logics, proving them to be AP-complete. It introduces inquisitive logics, information models, and switching models. The study focuses on the semantics of inquisitive logic, introducing special formulas like C+, C-, Dk, Sk, S0, Sk, Sl. The translation from propositional to inquisitive formulas is detailed along with a reduction of TQBF problem to MC(InqB), establishing PSPACE-completeness.

Stats

In this paper we give a reduction of the PSPACE-complete problem true quantified Boolean formulas TQBF to MC(InqB), thus settling that both MC(InqB) and MC(InqM) are PSPACE-complete.
The computational complexity of this problem is known for several logics (see, e.g., [4] for an overview of the classical results).
We present and study a polynomial-space reduction of the TQBF problem to the MC(InqB), thus showing that the problem is also PSPACE-hard.

Quotes

Key Insights Distilled From

by Gianluca Gri... at **arxiv.org** 03-22-2024

Deeper Inquiries

Inquisitive logics extend traditional logic systems by incorporating questions into the formalism. Unlike classical logic, which deals with statements that are either true or false, inquisitive logics allow for expressions that involve questions. This extension enables a more nuanced understanding of information states and their relationships to statements and questions. By introducing question-forming operators like inquisitive disjunction and window modality, inquisitive logics provide a richer semantic structure than classical logic.

The findings on computational complexity theory regarding model checking problems for inquisitive logics have significant implications. The research shows that these problems are PSPACE-complete, indicating that they belong to the class of problems solvable using polynomial space on a deterministic Turing machine. This classification provides insights into the inherent complexity of reasoning about information states supporting formulas in inquisitive propositional and modal logic.
Moreover, the reduction of PSPACE-complete problems like TQBF to model checking for inquisitive propositional logic demonstrates the practical relevance of studying these complexities. It highlights the computational challenges involved in verifying whether a given formula is supported by an information state within a model, shedding light on the intricacies of decision-making processes based on complex logical structures.

The research on model checking problems can be applied practically in various domains where formal verification and reasoning play crucial roles. For instance:
Software Verification: In software engineering, ensuring correctness and consistency is paramount. Model checking techniques can be employed to verify properties specified using inquisitive propositional or modal logic.
Artificial Intelligence: Understanding how machines reason about uncertainty or incomplete information is essential for AI systems' development. Inquisitive logics can offer insights into modeling such scenarios.
Knowledge Representation: Systems dealing with knowledge representation often encounter situations involving both statements and queries. Inquisitive logics provide a framework to handle such scenarios effectively.
By applying the results from this research to practical applications, organizations can enhance their decision-making processes, improve system reliability, and advance developments requiring sophisticated logical reasoning capabilities.

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