Running head: WEEK SIX ESSAY
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Square of Opposition
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West Coast University
WEEK SIX ESSAY
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"Square of opposition, in traditional logic, is a diagram exhibiting four forms of a
categorical proposition, or statement, with the same subject and predicate, together with their
pairwise relationships" (Encyclopaedia Britannica, n.d.). Categorical propositions are
propositions that disclose a simple relationship between a subject and a predicate. They have no
logical connection like "if, then" Categorical propositions include four elements: a subject, a
predicate, a copula, and a quantity expression. There are four types of categorical claims,
universal affirmative (A) statement, the universal negative (E) statement, the particular
affirmative (I) statement, and lastly, the particular negative (O) statement. The universal
affirmative (A) has the standard form "All." In these, it is universally stated that the term subject
encompasses the class of the predicate term. Universal negative (E) are propositions that have
the standard form "None." Where it is universally denied that the term subject comprises the
