Match List I with List II

List I (Obvertend) A. All S is P B. No S is P C. Some S is P D. Some S is not P
List II (Obverse) I. Some S is non-P II. No S is non-P III. All S is non-P IV. Some S is not non-P
Choose the correct answer from the options given below:

Correct option is C

Obversion is a logical transformation where the quality (affirmative or negative) of the proposition is changed while preserving its truth value by negating the predicate.
· A. "All S is P" → "No S is non-P" (A-II): This obversion involves negating the predicate and changing the quality from affirmative to negative.
· B. "No S is P" → "All S is non-P" (B-III): Negating the predicate and changing from a negative universal to an affirmative universal.
· C. "Some S is P" → "Some S is not non-P" (C-IV): The obverse changes "Some S is P" to a statement involving the negation of the predicate.
· D. "Some S is not P" → "Some S is non-P" (D-I): Here, the obverse simply negates the predicate, making the obverse equivalent.
Information Booster:
1. Obversion: A transformation in logic where the quality of the statement is changed, and the predicate is negated while preserving logical truth.
2. Types of propositions: Affirmative (e.g., "All S is P") and negative (e.g., "No S is P") propositions can be obverted.
3. Equivalence: Obversion creates logically equivalent statements without altering the truth value of the original proposition.
4. Logical transformations: Learning how to manipulate propositions through techniques like obversion and conversion is essential in formal logic.