Mark Sainsbury

When is a reason for doing or believing something a good reason? Over the past century, logicʹs 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. -- Book cover.

Sainsbury and Tye present a new theory, 'originalism', which provides natural, simple solutions to puzzles about thought that have troubled philosophers for centuries. They argue that concepts are to be individuated by their origin, rather than epistemically or semantically.

Mark Sainsbury presents an original account of how language works when describing mental states, based on a new theory of what is involved in attributing attitudes like thinking, hoping, and wanting. He offers solutions to longstanding puzzles about how we can direct our thought to such a diversity of things, including things that do not exist.