Propositional Letters in Logic
Propositional letters are fundamental variables in propositional logic. They act as placeholders…
Higher-Order Variables in Logic
A higher-order variable represents functions, predicates, or relations, distinguishing it from variables…
First-Order Variables in Logic
First-order variables are placeholders for individuals within a specific domain in first-order…
Existential Variable in Predicate Logic
An existential variable is a placeholder in predicate logic, bound by an…