Possible Worlds : an Introduction to Logic and Its Philosophy

Most current talk of possible worlds is still regarded as the province of professionals; little of it has filtered down to those who are just beginning to learn their philosophy. Yet there is no good reason why this should be so. Although the higher reaches of possible-worlds semantics bristle with technical subtleties, its basic insights are really very simple. This book explains what those insights are and uses them to construct an integrated approach to both the philosophy of logic and the science of logic itself.