In this thesis, the concept of random membership function is introduced. Thefuzzy degree is no more a determinant number, but a random variable. Random mem-bership function have more information than non-random membership function. Somediscussions about the properties of random membership function are presented, and theexamples show the reasonability of the the random membership function. From the re-lationship of the random set and random membership function, various combinationrules from stochastic point of view can be constructed.
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