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indirect proof

noun
1.
an argument for a proposition that shows its negation to be incompatible with a previously accepted or established premise.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for indirect proof
Historical Examples
  • Besides, we have an indirect proof of this in the very results of selective processes as, until now, they are practised.

  • Such a proof is also called an indirect proof, but this term is not altogether satisfactory.

    The Teaching of Geometry David Eugene Smith
  • 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
  • History gives us an indirect proof of the power of morality over man.

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

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

  • 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

noun
1.
(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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