What's the word for...

Discussion in 'Math' started by jut, Sep 5, 2009.

  1. jut

    Thread Starter Senior Member

    Aug 25, 2007
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    ...proving, or disproving something by a single counter example? For instance, if someone said "all birds can fly", I could disprove that by saying "there exist a bird called the penguin which cannot fly".

    I think it may be a latin word.

    And no, I'm not looking for the word "counter example".
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    How about a redargutory result?

    John
     
  3. AnalogDE

    New Member

    Sep 6, 2009
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    Proof by contradiction.
     
  4. AnalogDE

    New Member

    Sep 6, 2009
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    (also known as reductio ad absurdum, Latin for "by reduction toward the absurd")
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    How about "refutation"?
     
  6. rin-elt

    New Member

    Jun 18, 2009
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    proof by contradiction= "reducto ad absodum"
     
  7. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    That is not a valid Latin phrase according to http://www.nd.edu/~archives/latin.htm

    "absodum" is not in the Notre Dame Latin dictionary.

    John
     
  8. Ratch

    New Member

    Mar 20, 2007
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    jut,

    Why don't you ask thingmaker3. He is big on Latinisms.

    Ratch
     
  9. notxjack

    New Member

    Sep 7, 2009
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    it's a typo. he meant reducto ad absurdum, which is the phrase.
     
  10. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    I suspect you mean, "reductio ad absurdum," which does not meet the OP requirement for a single, contradictory example.

    John
     
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