Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • 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:

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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Examples

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Comments

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  • If A, then B.

    Not B.

    Therefore, not A.

    December 8, 2008