Negation alone does not guarantee contradiction. The subject, predicate, and relevant context must match.
Pair 1: Zayd is a teacher / Zayd is not a teacher — contradictory if qualifications match.
Pair 2: Zayd is a teacher / Amr is not a teacher — different subjects.
Pair 3: Zayd is a teacher / Zayd is not a poet — different predicates.
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A negative word is not enough
Contradiction and the Eight Conditions
Negation alone does not guarantee contradiction. The subject, predicate, and relevant context must match.
Pair 1: Zayd is a teacher / Zayd is not a teacher — contradictory if qualifications match.
Pair 2: Zayd is a teacher / Amr is not a teacher — different subjects.
Pair 3: Zayd is a teacher / Zayd is not a poet — different predicates.