Introduction to Logic

2nd Edition

By Harry J. Gensler

© 2011 – Routledge

432 pages

Purchasing Options:
Paperback: 9780415996518
pub: 2010-01-20
US Dollars$49.95
Hardback: 9780415996501
pub: 2010-01-20
US Dollars$150.00

Comp Exam Copy Companion Website

About the Book

Introduction to Logic combines likely the broadest scope of any logic textbook available with clear, concise writing and interesting examples and arguments. Its key features, all retained in the Second Edition, include:

• simpler ways to test arguments than those available in competing textbooks, including the star test for syllogisms

• a wide scope of materials, making it suitable for introductory logic courses (as the primary text) or intermediate classes (as the primary or supplementary book)

• engaging and easy-to-understand examples and arguments, drawn from everyday life as well as from the great philosophers

• a suitability for self-study and for preparation for standardized tests, like the LSAT

• a reasonable price (a third of the cost of many competitors)

• exercises that correspond to the LogiCola program, which may be downloaded for free from the web.

This Second Edition also:

• arranges chapters in a more useful way for students, starting with the easiest material and then gradually increasing in difficulty

• provides an even broader scope with new chapters on the history of logic, deviant logic, and the philosophy of logic

• expands the section on informal fallacies

• includes a more exhaustive index and a new appendix on suggested further readings

• updates the LogiCola instructional program, which is now more visually attractive as well as easier to download, install, update, and use.


“This new edition is a significant improvement on an already excellent text. The virtues of the original remain, including clear expositions, an intuitive proof procedure that generalizes naturally from propositional logic to more advanced logics, and a wealth of problems drawn from philosophical sources. There are new chapters on the history of logic, deviant logics and the philosophy of logic, and the accompanying LogiCola program has been improved. This is a student-friendly approach to logic.” Michael Bradie, Bowling Green State University

"Professor Gensler's Introduction to Logic is superb! Students are given a first-rate, accessible introduction to the fundamentals of logic through extensive examples from some of the great questions in the history of philosophy. Thus, students are learning philosophy even as they're doing logic. The free program accompanying the text, with its game format, is a genuine tutorial that enables students to master the concepts of each section through new examples and instant feedback. I strongly recommend this fine text for basic and more advanced courses in logic."Jay Aultman-Moore, Waynesburg University

“This new edition of Introduction to Logic is truly a revision and not just an update. The book has been reorganized in a much more logical sequence. Virtually every chapter in the first edition has been significantly revised for greater clarity…I believe that Gensler’s Introduction to Logic is the best text available today for teaching logic. I look forward to using his book for several years to come.”Darian C. De Bolt, University of Central Oklahoma

Table of Contents

1. Introduction Part 1: Syllogistic, Informal, and Inductive Logic 2. Syllogistic Logic 3. Meaning and Definitions 4. Fallacies and Argumentation 5. Inductive Reasoning Part 2: Classical Symbolic Logic 6. Basic Propositional Logic 7. Propositional Proofs 8. Basic Quantificational Logic 9. Relations and Identity Part 3: Advanced Symbolic Systems 10. Basic Modal Logic 11. Further Modal Systems 12. Deontic and Imperative Logic 13. Belief Logic 14. A Formalized Ethical Theory Part 4: Further Vistas 15. Metalogic 16. History of Logic 17. Deviant Logic 18. Philosophy of Logic

About the Author

Harry J. Gensler, S.J., is Professor of Philosophy at John Carroll University in Cleveland. Some of his other books include Gödel’s Theorem Simplified (1984), Formal Ethics (1996), Anthology of Catholic Philosophy (2005), Historical Dictionary of Ethics (2008), and Ethics: A Contemporary Introduction, Second Edition (2011).

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