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Impossible Worlds

Francesco Berto and Mark Jago


The latter half of the twentieth century witnessed an ‘intensional revolution’, a great collective effort to analyse notions which are absolutely fundamental to our understanding of the world and of ourselves—from meaning and information to knowledge, belief, causation, essence, supervenience, conditionality, as well as nomological, metaphysical, and logical necessity—in terms of a single concept. This was the concept of a possible world: a way things could have been. Possible worlds found applications in logic, metaphysics, semantics, game theory, information theory, artificial intelligence, ... More

Keywords: hyperintensionality, impossible worlds, metaphysics, epistemic logic, logical omniscience, imagination, information, non-classical logic, fiction, counterpossible reasoning

Bibliographic Information

Print publication date: 2019 Print ISBN-13: 9780198812791
Published to Oxford Scholarship Online: August 2019 DOI:10.1093/oso/9780198812791.001.0001


Affiliations are at time of print publication.

Francesco Berto, author
Professor of Logic and Metaphysics / ILLC Research Chair, University of St Andrews / University of Amsterdam

Mark Jago, author
Associate Professor of Philosophy, University of Nottingham

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Front Matter

Part I Impossibilities

Part II Logical Applications

Part III Philosophical Applications

11 Fiction and Fictional Objects

Co-authored with Christopher Badura

12 Counterpossible Conditionals

Co-authored with Rohan French, Graham Priest, and David Ripley

End Matter