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The A proposition, the universal affirmative (universalis affirmativa), whose form in Latin is 'omne S est P ', usually translated as 'every S is a P '. The E proposition, the universal negative (universalis negativa), Latin form 'nullum S est P ', usually translated as 'no S are P '.
The immediately inferred proposition is termed the "obverse" of the original proposition, and is a valid form of inference for all types (A, E, I, O) of categorical propositions. In a universal affirmative and a universal negative proposition the subject term and the predicate term are both replaced by their negated counterparts:
In Hamilton's illustration of the four categorical propositions [8] which can occur in a syllogism as symbolized by the drawings A, E, I, and O are: A: The Universal Affirmative Example: "All metals are elements." E: The Universal Negative Example: "No metals are compound substances." I: The Particular Affirmative Example: "Some metals are ...
The Ancient Greeks such as Aristotle identified four primary distinct types of categorical proposition and gave them standard forms (now often called A, E, I, and O). If, abstractly, the subject category is named S and the predicate category is named P, the four standard forms are: All S are P. (A form) No S are P. (E form) Some S are P. (I form)
e: No A is B. (negative) i: Some A is B. (affirmative) o: Some A is not B. (negative) The rule states that a syllogism in which both premises are of form a or i (affirmative) cannot reach a conclusion of form e or o (negative). Exactly one of the premises must be negative to construct a valid syllogism with a negative conclusion.
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