The antecedent of a rule incorporates two parts: an object (linguistic object) and its value. The object and its value are linked by an operator The operator identifies the object and assigns the value Operators such as"is",are, is not,are not are used to assign a symbolic value to a linguistic object Expert systems can also use mathematical operators to define an object as numerical and assign it to the numerical value age of the customer<18 and 'cash withdrawal>1000 THEn ' signature of parentis required 2021/1/27 EIE426-AICV2021/1/27 EIE426-AICV 7 ◼ The antecedent of a rule incorporates two parts: an object (linguistic object) and its value. The object and its value are linked by an operator. ◼ The operator identifies the object and assigns the value. Operators such as “is”, “are”, “is not”, “are not” are used to assign a symbolic value to a linguistic object. ◼ Expert systems can also use mathematical operators to define an object as numerical and assign it to the numerical value. IF ‘age of the customer’ <18 AND ‘cash withdrawal’ >1000 THEN ‘signature of parent’ is required