Difference between revisions of "Valid argument"

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==Blog posts==
 
==Blog posts==
  
*[http://lesswrong.com/lw/nf/the_parable_of_hemlock/] (tangentially related)
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*[http://lesswrong.com/lw/nf/the_parable_of_hemlock/ The Parable of Hemlock] (tangentially related)
  
 
==See also==
 
==See also==

Latest revision as of 07:07, 23 January 2011

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An argument is valid when it contains no logical fallacies. Such arguments are not necessarily sound, because the premises may be false. For instance, the following syllogism is valid but has a false conclusion:

  • All animals are dogs. (False premise/All A are B.)
  • All dogs are terriers. (False premise/All B are C.)
  • Thereforse, all animals are terriers. (False conclusion: not all animals are terriers. Valid logic: If all A are B, and all B are C, then all A are C.)

Blog posts

See also