Propositional letters are fundamental variables in propositional logic. They act as placeholders for specific, undefined propositions, enabling the construction and…
A higher-order variable represents functions, predicates, or relations, distinguishing it from variables that denote individual objects. This concept is fundamental…
First-order variables are placeholders for individuals within a specific domain in first-order logic. They are fundamental to expressing general statements…
An existential variable is a placeholder in predicate logic, bound by an existential quantifier. It signifies the existence of at…