VOCABULARY OF PHILOSOPHY – CONTRADICTORY

CONTRADICTORY.—The CONTRADICTORY of any Term is its mere negation, e.g., not-white is the contradictory of white. So the contradictory of any Proposition is its mere negation, e.g., Some men are not white is the contradictory of All men are white. The contradictory of the Universal Affirmative (A) is the Particular Negative (0); of the Universal Negative (E) the Particular Affirmative (I). Of two contradictory propositions, one is necessarily true and the other false.