modus ponendo tollens

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English[edit]

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Etymology[edit]

Borrowed from Latin modus pōnendō tollens (roughly, “mode where affirming infirms”).

Noun[edit]

modus ponendo tollens (uncountable)

  1. (philosophy, logic) A valid form of argument in which the antecedent of a conditional proposition is affirmed, thereby entailing the infirmation of the consequent. Modus ponendo tollens has the form:
    1. If P, then non-Q.
    2. P.
    3. Therefore, non-Q.

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