Fuzzy measures defined by fuzzy integral and their absolute continuity

Given a measurable space (X,J), a fuzzy measure mu on (X,J), and a nonnegative function f on X that is measurable with respect to J, we can define a new set function nu on (X,J) by the fuzzy integral. It is known that nu is a lower semicontinuous fuzzy measure on (X,J) and, moreover, if mu is finite, then nu is a finite fuzzy measure as well. In this paper, we generalize in several different ways the concept of absolute continuity of set functions, as defined in classical measure theory. In addition, we investigate the relationship among these generalizations by using the structural characteristics of set functions such as null-additivity and autocontinuity, and determine which types of absolute continuity of fuzzy measures are possessed by the fuzzy measure (or the lower semicontinuous fuzzy measure) obtained by the fuzzy integral. (C) 1996 Academic Press, Inc.