Introduction

What follows is not a treatise or manual of logic; it is merely an attempt to offer a vision of it from its roots in ordinary reasoning or common sense and that, while not specialized, is shared by all people. A vision that, albeit partial, covers relevant parts of modern logic that present notable applications. A vision that aims to complement and complete, but by no means nullify, what was learned in the manuals. If you have studied any of them, it will help you better understand what will be explained here and, if it deals with logic, it will not try to develop any of its specific parts by itself.