Includes bibliographical references (p. 335-349).

This book provides an introduction to the theory of fuzzy sets: mathematical objects modelling the vagueness of our natural language when we describe phenomena that do not have sharply defined boundaries. The book provides background information necessary to apply fuzzy set theory in various areas, including engineering, fuzzy logic, and decision-making. The exercises at the end of each chapter deepen the reader's understanding of the concepts and test their ability to make the necessary calculations.