From Wikipedia, the free encyclopedia

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.

Comparison between Boolean and fuzzy logic rules

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

See also

• Fuzzy logic