Matching Between Fuzzy Sets

In this chapter we consider problems, for which information is either imprecise or incomplete, or unknown. For example, description of emotions is burdened with definite subjectivity, just like the description of preferences, or judgment whether something is positive or negative. Thus, positive information states what is acceptable (e.g., what is possible or satisfactory, or permitted, or desired). Meanwhile, negative information expresses what is unacceptable (e.g., impossible or rejected, or forbidden). However, the positive and the negative information are related to each other, and they should not be taken into account separately.