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RULE EVALUATION:

You may have a rule like this:      If   SPEED=SLOW   and   HOME=FAR    then   GAS=INCREASE

Supose SLOW=0.25 and  FAR=0.82. The rule strength will be 0.25 (The minimum value of the antecedents) and the fuzzy variable INCREASE would be also 0.25.

Consider now another rule:       If   SPEED=MEDIUM   and     HIGHER=SECURE   then   GAS=INCREASE

Let be in this case,  MEDIUM=0.75 and  SECURE=0.5. Now the rule strength will be 0.5 (The minimum value of the antecedents) and the fuzzy variable INCREASE would be also 0.5.

So, we have two rules involving fuzzy variable INCREASE. The "Fuzzy OR" of the two rules will be 0.5 (The maximum value between the two proposed values).

INCREASE=0.5