Modal system

A modal system is a framework in logic that deals with different modes of truth, such as necessity, possibility, or belief. It provides formal tools to analyze statements like "It is necessary that" or "It is possible that," by defining rules for how these modal claims relate to each other. Think of it as a way to systematically explore questions about what must be true versus what could be true, helping us understand concepts like certainty, potential, and obligation within a rigorous, logical structure.