Logic is the skill that enables humans to think clearly, accurately, and rigorously and so to draw only the inferences that the evidence warrants. Some people, like scientists, engineers, mathematicians, and computer programmers, get plenty of on-the-job practice in thinking logically. The rest of us generally don’t. In this accessible, concise yet comprehensive introduction to a sometimes-formidable subject, philosopher Keith Parsons presents elementary topics in logic for people who have little background in mathematics or science and have no career goals in those fields. Parsons presupposes no specialized background and strives to introduce even abstract concepts in an intuitive and unintimidating way. His informal, conversational style leads the reader painlessly, even entertainingly, through three essential areas of logic. The first part of the book deals with sentential and predicate logic, as well as inductive and scientific reasoning, including inference to the best explanation. The second part explains basic probability, Bayes’ Theorem, and why thinking about probability is so prone to error and illusion. The third part considers informal reasoning and critical thinking, including such topics as rhetoric, fallacies, political spin, and the detection of pseudoscience and pseudohistory. Why be logical? Even if you’re a poet, an artist, or just a free spirit, logic can help you determine the facts behind the political propaganda, religious claims, advertising, and sales talk that we are all subjected to. As a logically literate person, you will be a better-informed citizen, wiser consumer, and a clearer thinker.

Introduction to Logic offers one of the most clear, interesting and accessible introductions to what has long been considered one of the most challenging subjects in philosophy. Harry Gensler engages students with the basics of logic through practical examples and important arguments both in the history of philosophy and from contemporary philosophy. Using simple and manageable methods for testing arguments, students are led step-by-step to master the complexities of logic. The companion LogiCola instructional program and various teaching aids (including a teacher's manual) are available from the book's website: www.routledge.com/textbooks/gensler_logic

Originally published in 1934. This fourth edition originally published 1954., revised by C. W. K. Mundle. "It must be the desire of every reasonable person to know how to justify a contention which is of sufficient importance to be seriously questioned. The explicit formulation of the principles of sound reasoning is the concern of Logic". This book discusses the habit of sound reasoning which is acquired by consciously attending to the logical principles of sound reasoning, in order to apply them to test the soundness of arguments. It isn’t an introduction to logic but it encourages the practice of logic, of deciding whether reasons in argument are sound or unsound. Stress is laid upon the importance of considering language, which is a key instrument of our thinking and is imperfect.

The present book discusses all aspects of paraconsistent logic, including the latest findings, and its various systems. It includes papers by leading international researchers, which address the subject in many different ways: development of abstract paraconsistent systems and new theorems about them; studies of the connections between these systems and other non-classical logics, such as non-monotonic, many-valued, relevant, paracomplete and fuzzy logics; philosophical interpretations of these constructions; and applications to other sciences, in particular quantum physics and mathematics. Reasoning with contradictions is the challenge of paraconsistent logic. The book will be of interest to graduate students and researchers working in mathematical logic, computer science, philosophical logic, linguistics and physics.

With our American Philosophy and Religion series, Applewood reissues many primary sources published throughout American history. Through these books, scholars, interpreters, students, and non-academics alike can see the thoughts and beliefs of Americans who came before us.