Smith P. An Introduction to Formal Logic 2ed 2020

Textbook in PDF format

Formal logic provides us with a powerful set of techniques for criticizing some arguments and showing others to be valid. These techniques are relevant to all of us with an interest in being skilful and accurate reasoners. In this very accessible book, extensively revised and rewritten for the second edition, Peter Smith presents a guide to the fundamental aims and basic elements of formal logic. He introduces the reader to the languages of propositional and predicate logic, and develops natural deduction systems for evaluating arguments translated into these languages. His discussion is richly illustrated with worked examples and exercises, and alongside the formal work there is illuminating philosophical commentary.
As the Preface explains, this is a very slightly corrected reprint of the second edition of my Introduction to Formal Logic, originally published in 2020 by Cambridge University Press