Edward de Bono coined the phrase "lateral thinking" to describe a process of thinking that is different from normal, vertical or forward thinking. Here are nearly a hundred mind-benders, from easy to fiendishly hard, that make you think laterally in order to explain the set of circumstances surrounding a seemingly inexplicable situation. 96 pages, 18 b/w illus., 5 3/8 x 8 1/4.

    

    Dummett regards the construction of a satisfactory theory of meaning as the most pressing task of contemporary analytical philosophy. He believes that the successful completion of this difficult assignment will lead to a resolution of problems before which philosophy has been stalled, in some instances for centuries. These problems turn on the correctness or incorrectness of a realistic view of one or another realm--the physical world, the mind, the past, mathematical reality, and so forth. Rejection of realism amounts to adoption of a variant semantics, and often of a variant logic, for the statements in a certain sector of our language. Dummett does not assume the correctness of any one logical system but shows how the choice between different logics arises at the level of the theory of meaning and depends upon the choice of one or another general form of meaning-theory. In order to determine the correct shape for a meaning-theory, we must attain a clear conception of what a meaning-theory can be expected to do. Such a conception, says Dummett, will form "a base camp for an assault on the metaphysical peaks: I have no greater ambition in this book than to set up a base camp."

    It teaches the theory of definition -- the different kinds of definition and the criteria by which each is judged. It also teaches that definitions are like tools in that some are better suited for a particular task than others.Several chapters are devoted to informal fallacies. A new classification is given for them, and the concept of proof is presented, without which some of the traditional informal fallacies cannot be explained adequately. Another chapter is devoted to division and classification, which occurs in all of the sciences.Other topics covered include the square of opposition, immediate inferences, and the syllogistic and chain arguments.

    The discussion is deeply informed by the belief-doubt model advocated by C. S. Peirce and John Dewey, of which the book provides a substantial analysis. Professor Levi then addresses the conceptual framework of potential changes available to an inquirer. A structural approach to propositional attitudes is proposed which rejects the conventional view that a propositional attitude involves a relation between an agent and either a linguistic entity or some other intentional object such as a proposition or set of possible worlds. The last two chapters offer an account of change in states of full belief understood as changes in commitments rather than changes in performance; one chapter deals with adding new information to a belief state, the other with giving up information. The book builds upon topics discussed in some of Levi's earlier work. It will be of particular interest to discussion theorists, epistemologists, philosophers of science, computer scientists, and cognitive psychologists.

    His magisterial Frege: Philosophy of Language is a sustained, systematic analysis of Frege's thought, omitting only the issues in philosophy of mathematics. In this work Dummett discusses, section by section, Frege's masterpiece The Foundations of Arithmetic and Frege's treatment of real numbers in the second volume of Basic Laws of Arithmetic, establishing what parts of the philosopher's views can be salvaged and employed in new theorizing, and what must be abandoned, either as incorrectly argued or as untenable in the light of technical developments.Gottlob Frege (1848-1925) was a logician, mathematician, and philosopher whose work had enormous impact on Bertrand Russell and later on the young Ludwig Wittgenstein, making Frege one of the central influences on twentieth-century Anglo-American philosophy; he is considered the founder of analytic philosophy. His philosophy of mathematics contains deep insights and remains a useful and necessary point of departure for anyone seriously studying or working in the field.