Modus tollendo tollens

Noun

Definitions

1.NounA valid form of argument in which the antecedent of a conditional proposition is infirmed, thereby entailing the infirmation of the consequent. Modus tollendo tollens has the form:

"1. If non-P, then non-Q.; 2. non-P.; 3. Therefore, non-Q."

Synonyms

modus tollendo ponens modus ponendo tollens modus tollens modus ponendo ponens modus ponens affirming the consequent modal material conditional counterfactual conditional proof unconditional modal logic

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