What is the obverse of 'No S are P'?

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Prepare for the Traditional Logic Memoria Press Test. Optimize your learning with flashcards and in-depth explanations to boost your exam readiness.

Multiple Choice

What is the obverse of 'No S are P'?

Explanation:
Obversion is formed by negating the predicate while keeping the subject and the universal form. So, for “No S are P,” you keep the subject S and the no-quantity, but negate P to its opposite: not-P. The result is “No S are not-P.” This stays universal and negates the predicate, exactly what obversion does. It’s helpful to note that “No S are not-P” is logically the same as “All S are P,” showing how negating the predicate can shift the proposition’s apparent form while preserving its universal quality. The other options do not reflect negating the predicate while keeping the same form.

Obversion is formed by negating the predicate while keeping the subject and the universal form. So, for “No S are P,” you keep the subject S and the no-quantity, but negate P to its opposite: not-P. The result is “No S are not-P.” This stays universal and negates the predicate, exactly what obversion does. It’s helpful to note that “No S are not-P” is logically the same as “All S are P,” showing how negating the predicate can shift the proposition’s apparent form while preserving its universal quality. The other options do not reflect negating the predicate while keeping the same form.

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