Information is a central topic in computer science, cognitive science and philosophy. In spite of its importance in the 'information age', there is no consensus on what information is, what makes it possible, and what it means for one medium to carry information about another. Drawing on ideas from mathematics, computer science and philosophy, this book addresses the definition and place of information in society. The authors, observing that information flow is possible only within a connected distribution system, provide a mathematically rigorous, philosophically sound foundation for a science of information. They illustrate their theory by applying it to a wide range of phenomena, from file transfer to DNA, from quantum mechanics to speech act theory.

"This important interdisciplinary text is ideal for graduate students and researchers in mathematics, computer science, philosophy, linguistics, logic, and cognitive science." Computing Reviews

"This iis an enjoyable book on information flow, an important recent topic in the study of logic, language and computation, enriching the science of information by a mathematically rigorous foundation." Mathematical Reviews

"...two thumbs up...." Complexity

"...an important book...useful...inspiring...accessible to most graduate students in logic, computer science, philosophy, mathematics, linguistics, and cognitive science. Everyone working in those areas will find material of interest in the book." Journal of Symbolic Logic