Square of opposition, in traditional logic, a diagram exhibiting four forms of a categorical proposition (q.v.), or statement, with the same subject and predicate, together with their pairwise relationships:in which A, E, I, and O are of the forms “Every S is P,” “No S is P,” “Some S is P,” and
PPT - 4.1 The Components of Categorical Propositions PowerPoint Presentation - ID:9395992
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Chapter 3 Categorical Logic Pursuing Truth: A Guide to Critical Thinking
A Class Room Logic, by George Hastings McNair—A Project Gutenberg eBook.
The Traditional Square of Opposition (Stanford Encyclopedia of Philosophy)