overly redundant. I found this approach to be both effective and fun. Finally, the book does not assume much (if any) prior knowledge of the field. I have only two negative comments. First, Chapters 4 and 5, while still good, are not as well written as the rest of the book. Second, the author occasionally refers to examples and definitions without telling the reader where the ideas are introduced. As a result, I had to flip through the book looking for text that I remembered reading, but whose details I couldn't recall. This situation may be helped by adding a glossary to future editions. Review of Modal Logic 6 Cambridge Tracts in Theoretical Computer Science ~ 5 3 Patrick Blackburn, Maarten de Rijke, and Yde Venema Cambridge University Press, 2001 Reviewer: P. Daniel Hestand Overview Most people, upon hearing the phrase "modal logic," envision the logic of possibilities or contingent truth. The phrase also brings to mind the notion of truth in all "possible worlds" and even the typical modal operators, O and D. These views, while correct, are somewhat limited in scope. This book attempts (and succeeds, in my opinion) to update that view. The topic of
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