Rule

A rule is a special type of function whose inputs and outputs are expressed as binary truth statements.

Rules are used in various domains such as expert systems, decision-making processes, and automated reasoning to derive conclusions based on given conditions. They work by evaluating the truth values of their inputs using boolean operators and producing a binary output.

For example, a rule in a medical diagnosis system might state: IF (symptom A AND symptom B) OR symptom C THEN diagnosis D.