Mark Last

Abraham Kandel, one of the pioneers of fuzzy logic research, has numerous theoretical and practical contributions in the field of fuzzy systems. Mark Last's main contribution to the field of fuzzy logic includes the introduction of fuzzy based automatic perception and info fuzzy networks. Dan Tamir has been active in the area of formalization of axiomatic fuzzy logic and in applications of fuzzy logic in pattern recognition. One of the recent research threads pursued by Kandel, Last, and Tamir is complex fuzzy logic. This chapter provides a brief review of the contribution of the authors to the field of fuzzy logic as well as a survey on current state of the theory of complex fuzzy sets, complex fuzzy classes, and complex fuzzy logic.