A new introduction to modal logic /
Hughes, G. E.(George Edward),1918-
Cresswell, M. J.(Maxwell John),1939-
Hughes, G. E.(George Edward),1918-Introduction to modal logic.
Hughes, G. E.(George Edward),1918-Companion to modal logic.
London : Routledge,
1996.
This entirely new work replaces the authors' An introduction to modal logic and A companion to modal logic.
Includes bibliographical references and index.
Modality (Logic)