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)
*[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

Wikipedia has an article about

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