Non sequitur (logic) - Wikipedia, the free encyclopedia - The Diigo Meta page

• 21 Jan 14
  

  Samra Iqbal

  metamorphosis

• 31 Aug 12
  

  Marc-Alexandre Gagnon

  logic words

• 20 Jul 12
  

  Mark Serrano

  logic words Non sequitur

• 30 Jun 12
  

  elvisofdallas

  auto-pedagogy words logic wikipedia philosophy wiki fallacy logical speech fallacies Non sequitur delicious

• 13 Jun 12
  

  rocketshooter
  • argument in which its conclusion does not follow from its premises.
• 17 Nov 11
  

  Ryan Hull
• 19 Apr 10
  

  caganaksak

  logic words latin

• 18 May 08
  

  harry palmer

  Non sequitur (Latin for "it does not follow."), in formal logic, is an argument where its conclusion does not follow from its premises.[1] In a non sequitur, the conclusion can be either true or false, but the argument is a fallacy because the conclusion does not follow from the premise. All formal fallacies are specific types of non sequitur. The term has special applicability in law, having a formal legal definition.
  
  Here are two types of non sequitur of traditional noteworthiness:
  
  1) Any argument that takes the following form is a non sequitur:
  
  1. If A is true, then B is true.
  2. B is stated to be true.
  3. Therefore, A must be true.
  
  Even if the premises and conclusion are all true, the conclusion is not a necessary consequence of the premises. This sort of non sequitur is also called affirming the consequent.
  
  An example of affirming the consequent would be:
  
  1. If I am a human (A) then I am a mammal. (B)
  2. I am a mammal. (B)
  3. Therefore, I am a human. (A)
  
  "I" could be another type of mammal without being a human. While the conclusion may be true, it does not follow from the premises. This argument is still a fallacy even if the conclusion is true. It is a non sequitur (note that it is the exact same argument form as in example 1 - the form is always a non sequitur).
  
  2) Another common non sequitur is this:
  
  1. If A then B. (e.g., If I am in Tokyo, I am in Japan.)
  2. Not A. (e.g., I am not in Tokyo.)
  3. Therefore, not B. (e.g., Therefore, I am not in Japan.)
  
  The speaker could be anywhere else in Japan. This sort of non sequitur is called denying the antecedent.
  
  (If either of the above examples had "If and only if A, then B" as their first premise, then they would be valid and non-fallacious but unsound.)
  
  Many other types of known non sequitur argument forms have been classified into many different types of logical fallacies. In everyday speech and reasoning, an example might be: "If my hair looks nice, all people will love me." However, there is no real connection between y

  logic words auto-pedagogy philosophy

Would you like to comment?

Join Diigo for a free account, or sign in if you are already a member.