On the Logic of Demonstratives

On the Logic of Demonstratives examines how context-dependent expressions like "I," "here," "now," and "that" function in natural language and formal logic. Kaplan develops a systematic framework for analyzing demonstratives and indexicals, introducing key concepts like character and content. The book establishes a distinction between pure indexicals and true demonstratives, exploring how their meanings depend on the context of utterance. Through formal semantic analysis, Kaplan demonstrates the role of direct reference in determining the truth conditions of statements containing demonstratives. The work represents a major contribution to the fields of logic, semantics, and philosophy of language. Its influence extends beyond academic philosophy into linguistics, cognitive science, and theories of artificial intelligence. The book challenges traditional views about meaning and reference, raising fundamental questions about the relationship between language, thought, and reality. Its formal treatment of context-dependence provides a foundation for understanding how humans use language to communicate about their immediate environment.

There are not enough internet reviews to create a summary of this book. Instead, here is a summary of reviews of David Kaplan's overall work: Readers across academic and philosophical forums respect Kaplan's technical precision and his impact on formal semantics. His papers receive attention primarily from philosophy students, professors, and researchers. Readers appreciated: - Clear explanations of complex concepts in "Demonstratives" - Formal rigor in analyses of indexicals and direct reference - Useful examples that illuminate abstract ideas - Historical scholarship on Frege and other logicians Common criticisms: - Dense, technical writing style makes works inaccessible to beginners - Limited availability of some key papers outside academic institutions - Lack of practical applications or real-world examples On Goodreads and PhilPapers, Kaplan's works receive frequent citations but few public reviews due to their specialized academic nature. His papers appear frequently on philosophy course syllabi and reading lists. Academic citation indexes show high impact factors for "Demonstratives" and his work on direct reference theory. Online philosophy forums like r/askphilosophy regularly recommend Kaplan's papers for advanced study of formal semantics and philosophy of language.

Demonstratives by John Perry This text explores indexicals and demonstrative expressions through a systematic analysis of their role in language and thought.

The Philosophy of Language by Scott Soames The book examines semantic theories of reference, names, and demonstratives from both historical and contemporary perspectives.

Direct Reference: From Language to Thought by François Recanati This work builds on Kaplan's theories by investigating the relationship between direct reference and mental content.

Reference and Existence by Saul Kripke The text presents theories of reference and existence that complement Kaplan's analysis of demonstratives and indexicals.

Frege: Philosophy of Language by Michael Dummett This comprehensive study connects Frege's theories of sense and reference to modern discussions of demonstratives and indexicality.

🔹 The book introduces and explores the concept of "character" and "content" in demonstratives (words like "this," "that," "here," "now"), which has become foundational in modern philosophy of language. 🔹 David Kaplan wrote much of the book while at UCLA, where he spent most of his career and helped establish one of the world's leading centers for philosophical logic. 🔹 The work challenged previous theories by arguing that words like "I" and "now" are "directly referential" - they point directly to their referents without going through a descriptive meaning. 🔹 The book's framework has influenced fields beyond philosophy, including linguistics, cognitive science, and artificial intelligence, particularly in understanding context-dependent language. 🔹 Kaplan's theory makes a crucial distinction between "contexts of utterance" and "circumstances of evaluation," which helped resolve several paradoxes about time and modality in logic.