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In mathematics, vague sets are an extension of fuzzy sets.
In a fuzzy set, each object is assigned a single value in the interval reflecting its grade of membership. This single value does not allow a separation of evidence for membership and evidence against membership.
Gau et al. proposed the notion of vague sets, where each object is characterized by two different membership functions: a true membership function and a false membership function.This kind of reasoning is also called interval membership, as opposed to point membership in the context of fuzzy sets.
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