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Aristotle's De InterpretationeContradiction and Dialectic$
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C. W. A. Whitaker

Print publication date: 2002

Print ISBN-13: 9780199254194

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0199254192.001.0001

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Chapter 13: More on Modal Assertions

Chapter 13: More on Modal Assertions

(p.161) 13 Chapter 13: More on Modal Assertions
Aristotle's De Interpretatione

C. W. A. Whitaker

Oxford University Press

The discussion of modal assertions is now broadened to include the inferences, which may be drawn between them. The Modal Square of Opposition is set out, problems with the initial formulation are revealed and dealt with by ensuring that a single sense of possibility occurs throughout (possibility is implied by necessity, not excluded by it). In a final comment, Aristotle explains the importance of these assertions: possibility and necessity are the origins of the being, and not being of everything.

Keywords:   Aristotle, assertion, De Interpretatione, inference, modal, modality, necessity, possibility, square of opposition

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