Quality (Categorical Proposition)

In Categorical Logic, each of the standard form propositions can be identified by its quality and its quantity. The quality of a categorical proposition is either affirmative or negative.

For example, there are two universal and two particular propositions and each one will either be affirmative or negative:

The quality of each proposition is determined by whether it is affirming or denying a relationship between the subject (S) and predicate (P).