In fuzzy logic, when we associate an element with a set, we usually do it in terms of membership grade which suggests the "belonging" of this element to the set. Membership grade value 0 means that the element is certainly not the set member while grade value = 1 means that the element is definitely a part of the set. In some problems that I was solving, I came across membership grade values of some elements greater than 1. What does it actually mean?
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