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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 10: Three Types of Assertions

Chapter 10: Three Types of Assertions

(p.132) 10 Chapter 10: Three Types of Assertions
Aristotle's De Interpretatione

C. W. A. Whitaker

Oxford University Press

The task of classifying contradictory pairs continues in the chapters that follow, but no new exceptions to RCP are found. Here, assertions are examined and their contradictory pairs set out, beginning with the most basic, in which ’is’ is added to a name. Next the role of the verb ’to be’ as an ’additional predicate’ is seen, in sentences such as ’man is just’, and finally assertions are considered in which there is no ’to be’, and a verb is simply added to a name. Contradictory pairs are examined which involve the use of negative subjects as well as negative predicates, universally and non‐universally. We see here a careful discussion of the different ways in which negation can be applied in a sentence, and guidance on how to tell which assertions are the contradictories of which others.

Keywords:   Aristotle, assertion, contradictories, contradictory, De Interpretatione, negation, negative predicate, negative subject, predicate, to be

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