Translated from Spanish by Inés Gutiérrez
This work follows an exposition order which strictly corresponds to the second unit, “Logic”, in
the official syllabus for the “Elements of Philosophy” course. Each of the chapters
corresponds to an item of the program, providing material for a week’s work.
The system of logic and special symbols used in some of the exercises are an exclusive creation of the first of the authors.
We have endeavored to include interesting examples with social or civic content to illustrate
the different problems, similar to those in the main book. The statements used in the exercises
do not necessarily correspond to the authors' thoughts, nor is the student required to accept
them. Since the student will have to apply the knowledge learned here when confronting real-life problems, we have considered it preferable to use polemical examples rather than the indisputable statements of the type “Socrates is mortal” included in more conventional textbooks. Nevertheless, we have been careful to avoid examples overcharged with emotional content, which could interfere with the serene use of reflection. The reader will say if we succeeded in finding the approximate middle term between the passionate and the anodyne.