negating the antecedent and the consequent

<philosophical terminology> a fallacy of the form:

	p -> q
	___________
	~ p -> ~ q

Example: "If my daughter is sixteen, then I am over thirty. Therefore, if my daughter is not sixteen, then I am not over thirty." This pattern of reasoning should be distinguished from legitimate cases of Transposition.

<A Dictionary of Philosophical Terms and Names>

<2002-02-21>

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Nearby terms: necessary - contingent « necessary - sufficient « necessitarianism « negating the antecedent and the consequent » negation » negation by failure » negation completeness