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indirect proof

an argument for a proposition that shows its negation to be incompatible with a previously accepted or established premise. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for indirect proof
Historical Examples
  • Such a proof is also called an indirect proof, but this term is not altogether satisfactory.

    The Teaching of Geometry David Eugene Smith
  • He really gives an indirect proof of the reverse theory, as E. Dubois-Reymond rightly observed in his brilliant memorial speech.

    The Wonders of Life Ernst Haeckel
  • Besides, we have an indirect proof of this in the very results of selective processes as, until now, they are practised.

  • It is an indirect proof, from the side of particular things themselves, of the identity of all in the One.

    Giordano Bruno James Lewis McIntyre
  • History gives us an indirect proof of the power of morality over man.

  • This declaration, in itself an indirect proof of guilt, occasioned some commotion in the House.

  • Besides, there is indirect proof that Napoleon looked on our blockade of the northern coasts as not unreasonable.

  • Since a direct proof is impossible, an attempt was made to construct an indirect proof by a comparison of bodily-organs.

    At the Deathbed of Darwinism Eberhard Dennert
  • At present I am content with the indirect proof that the existence of such a standard is necessary to the existence of the arts.

    Statesman Plato
  • This appears to us to be an indirect proof that the half lines in Virgil are often complete as they stand.

British Dictionary definitions for indirect proof

indirect proof

(logic, maths) proof of a conclusion by showing its negation to be self-contradictory; reductio ad absurdum Compare direct (sense 17)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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