«زيد قائم، وعمرو ليس بقائم»
Zayd is standing, and Amr is not standing.
These are not contradictory. The first is about Zayd, the second about Amr. Both could easily be true together.
Compare:
“Zayd is standing.”
“Zayd is not standing.”
Now the subject is identical. Yet identity of subject alone is insufficient: time, place and all relevant qualifications must also match. Contradiction negates the very same complete claim.
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Contradiction: Definition, Conditions and Application to Propositions
«زيد قائم، وعمرو ليس بقائم»
Zayd is standing, and Amr is not standing.
These are not contradictory. The first is about Zayd, the second about Amr. Both could easily be true together.
Compare:
“Zayd is standing.”
“Zayd is not standing.”
Now the subject is identical. Yet identity of subject alone is insufficient: time, place and all relevant qualifications must also match. Contradiction negates the very same complete claim.