Fuzzy rule

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A fuzzy rule is defined as a conditional statement in the form: IF x is A THEN y is B where x and y are linguistic variables; A and B are linguistic values determined by fuzzy sets on the universe of discourse X and Y, respectively.

A classical IF-THEN statement uses binary logic, for instance: IF man_height is > 180cm THEN man_weight is > 50kg

Classical rules are expressed in Boolean logic.On the other hand, fuzzy rules are multi-valued. In fuzzy rules, the universe of discourse of the variable man_height is a fuzzy set (tall, medium, short). For example: IF man_height is tall THEN man_weight is heavy

[edit] See also

• Fuzzy logic