40 Years of Intuitionistic Fuzzy Sets

Dear Colleagues,

The present Special Issue aims to commemorate the 40th anniversary of the invention of the concept and theory of intuitionistic fuzzy sets. Defined for the first time in 1983 in Bulgaria by Krassimir Atanassov (1954), intuitionistic fuzzy sets have grown from a “mathematical game”, devised in а hospital bed to make time pass faster, to one of the most powerful, theoretically backed up, practically usable, and actively researched extensions of Lotfi Zadeh’s fuzzy sets.

From a historical perspective, during the first twenty years of the existence of intuitionistic fuzzy sets, they were mostly developed by Atanassov and a small group of researchers around him, and mainly from the viewpoint of mathematical logic, algebra, analysis and geometry. With the advancement of information technologies and the development of the ideas of the applicability of IFS to decision science, the interest in the concept has steadily broadened, due to the efforts and creativity of a growing community of researchers and practitioners in the areas of decision making, artificial intelligence, engineering, medicine, economics and other areas.  

As an idea that appeared well before its time, intuitionistic fuzzy sets provide us with theoretically rigorous and practically useful instruments to handle the inherent uncertainty that defines the times we live in.

Dr. Vassia Atanassova
Prof. Dr. Tania Pencheva
Dr. Peter Vassilev
Guest Editors

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