What does the quality of a proposition indicate?

• A. What does the quality of a proposition indicate?
• B. Whether it is true or false
• C. Whether it is universal or particular
• D. Whether it is hypothetical or categorical

Answer: (A)

Quality of a proposition tells you whether it is affirmative or negative. In traditional logic, this quality shows if the statement asserts something about the subject (affirmative) or denies it (negative). It’s not about whether the proposition is true or false—that’s its truth value. It’s also not about whether it’s universal or particular (that’s quantity) or about the mood (hypothetical or categorical). For example, "All dogs are mammals" is affirmative and universal; "No dogs are mammals" is negative and universal; "Some dogs are mammals" is affirmative and particular; "Some dogs are not mammals" is negative and particular. The essence of the question is that quality flags affirmation versus negation.