A logical fallacy in which the predicate term of the conclusion of a categorical syllogism is a universal, but the same term in the premises is a particular.

Example:
  All women are mortals.
  No men are women.
  Therefore, no men are mortals.

To prove the major illicit, show that there may be members of the predicate category not mentioned in the premises which are contrary to the conclusion. In the above example, "Socrates was a man, and he was mortal, so it is not true that no men are mortals."

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