In dictionaries:
modus ponendo ponens
(philosophy, logic) A valid form of argument in which the antecedent of a conditional proposition is affirmed, thereby entailing the affirmation of the consequent. Modus ponendo ponens has the form:
modus tollendo ponens
(philosophy, logic) A valid form of argument in which the antecedent of a conditional proposition is negated, thereby entailing the affirmation of the consequent. Modus ponendo tollens has the form:
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