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
Venn diagram for three sets Download Scientific Diagram
The Square of Opposition Diagram
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Square of opposition for the categorical statements from syllogistics.
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