From Crisp Sets to Fuzzy Sets

We are now starting the second part of this book. After the introduction to the Lisp programming language in part I, you are now ready to begin the phase of our travel that will require the most of you. Not because it is complex, but because it represents a shift of paradigm not only in the way we think about sets, but also in the form that we usually reason and analyze things. We shall start revisiting the essentials of classic sets theory, including the concepts of belonging to a set, union and intersection of sets, general properties of sets and the concepts of Cartesian Product and Relations between sets.