Modus-tollens Definition
noun
(philosophy, logic) A valid form of argument in which the consequent of a conditional proposition is denied, thus implying the denial of the antecedent. Modus tollens has this form.
1. If P, then Q.
2. Not Q.
3. Therefore, not P.
Wiktionary
Origin of Modus-tollens
-
From modus tollendō tollēns (“the mode where the denying denies”), from modus (“mode”) and forms of tollō (“I deny”).
From Wiktionary
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