Question

When to use predicate logic and proposition logic?

Answer 1

The precise distinction between propositional and predicate logic is the infinite. Propositional logic deals with finite models, whereas predicate logic deals with infinite structures as well.

Answer 2

A proposition has a specific truth value, either true or false. A predicate's truth value depends on the variables' value. Scope analysis is not done in propositional logic. Predicate logic helps analyze the scope of the subject over the predicate