«زيد قاعد، وزيد ليس بقائم»
Zayd is sitting, and Zayd is not standing.
The subject is identical, but one proposition affirms sitting while the other denies standing. Both may be true; they are not contradictory.
The exact contradictory of “Zayd is sitting” is “Zayd is not sitting”, not “Zayd is not standing”.
The predicate affirmed must be the very predicate denied. Substituting another predicate changes the claim under discussion.
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Contradiction: Definition, Conditions and Application to Propositions
«زيد قاعد، وزيد ليس بقائم»
Zayd is sitting, and Zayd is not standing.
The subject is identical, but one proposition affirms sitting while the other denies standing. Both may be true; they are not contradictory.
The exact contradictory of “Zayd is sitting” is “Zayd is not sitting”, not “Zayd is not standing”.
The predicate affirmed must be the very predicate denied. Substituting another predicate changes the claim under discussion.