Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An indirect argument which proves a thing by showing the impossibility or absurdity of the contrary.

from the GNU version of the Collaborative International Dictionary of English

  • n. An indirect argument which proves a thing by showing the impossibility or absurdity of the contrary.

from The Century Dictionary and Cyclopedia

  • n. In logic: Abduction (which see). The demonstration of a proposition by the refutation of its opposite (from Aristotle's ἡ εἰς το\ ἀδύνατον ἀπαγωγή, reduction to the impossible): commonly called indirect proof.
  • n. In mathematics, a progress or passage from one proposition to another, when the first, having been demonstrated, is employed in proving the next.

Etymologies

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Examples

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