Which transformation keeps the subject the same but negates the predicate?

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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

Which transformation keeps the subject the same but negates the predicate?

Explanation:
Obversion is the operation that keeps the subject term the same while negating the predicate term. In obversion you take a categorical proposition and negate its predicate, leaving the subject and the quantity (universal or particular) unchanged. For example, from All S are P you obtain All S are not P. This directly satisfies keeping S the same and making the predicate not P. The other transformations don’t fit this criterion: negation would deny the entire proposition, not just the predicate; conversion swaps the subject and predicate; contraposition relates to a conditional form and changes the relationship in a different way. So this description matches obversion.

Obversion is the operation that keeps the subject term the same while negating the predicate term. In obversion you take a categorical proposition and negate its predicate, leaving the subject and the quantity (universal or particular) unchanged. For example, from All S are P you obtain All S are not P. This directly satisfies keeping S the same and making the predicate not P.

The other transformations don’t fit this criterion: negation would deny the entire proposition, not just the predicate; conversion swaps the subject and predicate; contraposition relates to a conditional form and changes the relationship in a different way. So this description matches obversion.

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