modus tollens

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English[edit]

Alternative forms[edit]

  • MT (initialism)

Etymology[edit]

From modus tollendō tollēns (the mode where the denying denies), from modus (mode) and forms of tollō (I deny).

Noun[edit]

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modus tollens (uncountable)

  1. (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.

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Related terms[edit]

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