When is a reason for doing or believing something a good reason?
Over the past century, logic's contribution to answering this
question has typically involved finding ''logical forms": that is,
using a special notation to bring out logical features more
clearly.
The correct identification of logical forms has been held to be
important not only to logic but also to philosophy. Bertrand
Russell coined the phrase "philosophical logic" to describe an
approach to philosophical problems: find the correct logical form
of the problematic sentences, and the problems vanish. "Logical
Forms" explains both the theoretical underpinnings of the approach
and the detailed problems involved in finding logical forms in the
languages of propositional logic, classical first order logic,
modal logic, and some alternatives such as free logic, binary and
substitutional quantifiers.
This revised edition incorporates results of recent work.
Chapter 3 on conditionals, and the sections dealing with predicate
quantifiers, free logics and subjunctive conditionals have been
completely rewritten. The exercises are integrated throughout the
book, and each chapter concludes with updated notes to guide
further reading. The result is a genuinely interactive introduction
which engages the reader in developing the argument.
This book does not presuppose knowledge of deductive methods in
formal logic and it will be of immense benefit to those approaching
philosophical logic for the first time.
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