“…Bustince et al in [4] introduced a new class of aggregation functions called overlap functions, which are basically continuous, positive and commutative 2dimensional aggregation operators [3]. From them several theoretical and applied research on this kind of function have been made (see for example [2,6,10,11,12,17,19]). Overlap function has been applied in classification problems where the classes are not clearly separated (see for example [16]) and in decision making based on fuzzy preference relations (see for example [6]).…”