An affirmative proposition attributes a predicate to its subject; a negative proposition denies it. “Zayd is educated” affirms; “Zayd is not educated” denies. Affirmative does not mean true, and negative does not mean false.
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Affirmative versus negative categorical propositions
Propositions: Categorical and Conditional Forms
An affirmative proposition attributes a predicate to its subject; a negative proposition denies it. “Zayd is educated” affirms; “Zayd is not educated” denies. Affirmative does not mean true, and negative does not mean false.