Minimum about fuzzy logic
Deffuzification

By set of rules enumeration we generally obtain several output logical variables (output terms) whose verity is nonzero. Each logical conclusion has different verity as is usual in fuzzy logic, but the same situation is in conclusions from several experts whose advised the same problem. With a set of multivalent (sometimes also with contradictory) results is difficult to work. That is the reason why is necessary to obtain unique result – one concrete value for each output language variables, e.g. “diagnosis” about bearign situation (“risk of retention by bearing is 38”) or value of action hit by fuzzy regulator (“turn on the lid to 27%”, “voltage for gearing = 5,6 V”, “valve slightly open by impulse in duration 3,8 s”). Procedure how to make unique (sharp) result from the set of multivalent fuzzy logical conclusions is called defuzzification.