S4 is a modal logic system defined by reflexivity and transitivity axioms for its accessibility relation. This system implies that…
A branch of modal logic exploring modes of truth beyond necessity and possibility. It encompasses deontic logic (duty/permission) and epistemic…
Multi-modal logic extends classical modal logic by integrating multiple distinct types of modalities. It handles variations in necessity, possibility, knowledge,…
Modal operators like necessity (◻) and possibility (◊) alter a statement's truth value, indicating whether it must be true or…
Modal logic is a branch of logic that formally explores concepts like necessity, possibility, and obligation. It uses modal operators…
Erotetic logic, also known as the logic of questions and answers, formalizes the study of interrogatives and their answers. It…
A paradox in epistemic logic concerning self-reference, where a statement claims its own unprovability or unknowability, leading to logical contradictions.
A frame in modal logic defines a set of possible worlds and the accessibility relation between them. It serves as…
The Fitch paradox, a puzzle in epistemic logic, challenges our understanding of knowledge. It suggests that if certain axioms of…
A specialized field of modal logic focusing on formalizing reasoning about knowledge and belief. It uses modal operators to represent…